1. These troops can't be everywhere or else they'd be spread too thin. Even if it's just a podunk ship attacking undefended mining colonies, that's a gnat that is buzzing around where they don't want it.
Even a mining colony in Hegemony space is liable to have some defense capacity. If nothing else because a mining facility would have a major slave component that needs to be controlled and can't be left open to the nearest abolitionist to fly in and attack the garrison.
2. The assumption that we will have void superiority means that either the defenders won't be able to move troops to where they're needed in time to handle lightning raids, or they're exiting the atmosphere where they can be swatted down like flies.
We'll have fighters and nothing better. Forget the idea of void superiority in all worthwhile cases. The Batarian Hegemony isn't stupid; even if it's a bunch of old, third rate frigates they'll station a force, and what ParSec can muster won't be enough to break that without risking the entire mission.
3. I was operating under the assumption that there would be more than just troop transports deployed here.
Yes. Fighters. Everything else the SA said 'works for us now.'
4. Fomenting a slave revolt on key planets means that rather than having to ship in a battalion of soldiers, we can ship in four battalions of war material and some advisors. While slaves aren't going to have the training and discipline expected of soldiers, there's a lot more of them and they're the kind of problem that a slaveowning society can't really ignore. There's going to be more to it than just dropping off some guns and saying "good luck guys" if we want it to be successful, but just doing that is going to be a nontrivial threat to that planet's public security.
Even a slave army of several thousands is not going to be much of a threat for the Hegemony, and with as limited forces and time we'll have during these raids that's the best we can expect. Even per planet.
6. It costs money to construct facilities. It costs more money to harden those facilities. It costs yet more money to keep these facilities up-to-date. PI has been pushing the state of the art in weapons for some time now, while the Hegemony's economy hasn't been booming the same way. While I'm sure their critical facilities have been kept updated, their merely important ones have likely flagged behind. I doubt these facilities are immune to being attacked.
Hardening facilities against orbital bombardment isn't hard, especially when there are hard limits to the size of attacking threats you can expect. Outside of dreadnought scale weaponry it's highly likely that all Hegemony facilities are too well defended by either being buried or by being under a GARDIAN umbrella of some sort. At least for incidental riding of the weight ParSec can muster.
7. Furthermore, it's not just the central government that are viable targets; freeing the factory workers, miners, farmhands, domestic servants etc of Batarians and evacuating them is at least as useful as it removes workers from the Batarian war machine, freed slaves provide more PR grist for the mill (not particularly needed here, but every little bit helps), frees up more labor for us if they're repatriated (though honestly I expect they'll be a mild drain on us for the duration of the conflict, unless some of them want to turn around and enlist so they too can punch four eyes and get paid for it) and is a morale hit to the Batarians because in addition to anti-war propoganda flooding their portion of the exo-net (where anyone with eyes to see can find it) the civilians have lost their slaves, the beings on whom their economy is based. What are you going to do, make the overseer assemble components somewhere? Credit the loss of the slaves to the owners and shuffle around some spare stock so more can go to work in an demonstrably vulnerable factory? The common Batarian loses out in their quality of life, economically, have to deal with negativity flooding their recreation...
... The Batarian Hegemony
is not a democracy. It does
not know free speech. It does not
pretend to be a democracy either. It has a dedicated internal and external spying agency that's considered effective enough that Hegemony space is effectively an information black hole. The public won't have a clue.
Evacuating workers from the Batarian workforce will not make a meaningful impact when thousands of people per day is a
rounding error. The economy won't care.
How are you measuring 'worthwhile impact'? Because as I'm seeing it this would be "free" forces here; combatants that weren't already engaged in the conflict in some way. Paragon Securities is forwarded to the SA military for the duration of hostilities (though so far they've only called up the naval elements). The lift capabilities are being called in basically ex nihlo (well, sort of; these cruise liners weren't going to charter themselves) and the Terminus Specials and crew from the Hierarchy would basically be a way to deniably allow Turians to help out in the conflict; they were hired by ParSec, so it's under the humans' umbrella.
This would be an option but is
not being decided right now. Only ParSec's force disposition. And ParSec has constraints that make this impossible. If we do something the Alliance does not like, like wasting ParSec's forces on risky low return jobs they'll turn ParSec into a branch of the Alliance military and tell us to fork over the cash to keep it working until after the war is over, when they'll consider compensating ParSec for the assistance offered.
Furthermore, having Terminus Specials wandering around in the Hegemony's back yard is going to be problematic for them because, historically, the pirates have been allies (if not friends) of the Hegemony. If you've got pirate ships attacking Batarian worlds they're going to have some decisions to make. Do they deny their auxiliaries access to their worlds (alienating the pirates, whose crews are in this for the plunder even if the commanders are true blue patriots)? Do they spread out their garrison fleets to try and hunt them down (making patrolling ships more vulnerable to surprise-Pydnas)?
Deployment of military grade frigates are not a question ParSec needs to wonder about right now, as right now the total amount of such ships available to ParSec is zero and will
remain zero for the foreseeable future. Acquiring the services of another PMC from outside the Alliance would be politically very complicated.
Yes, and this is meant to further weaken the Hegemony's war economy by removing workers from their workforce and disrupting their production.
Nothing of worth could we do with what little forces we've got.