Well, we are selling the Tigers, right? It's only prudent to assume that at some point in the future, someone may use that against us.
Yes the possibility exists that someone may steal some Tigers and use them in the future. Fortunately that's a problem that is almost certainly
years away and by then the Tiger will be obsolete.
Beside, even if our tech got flawless blackbox, that doesn't mean we're immune to someone knocking down the wall of our labs and nab the database. Granted, it's not likely, but still in the realm of possibility.
...people have already tried this.
Twice. It didn't work out either time. There is a reason we have (most) of a
fleet overhead and an army's worth of ground based defenses.
Nah the real risk is infiltrators getting past our HR screening. As what happened with Mordin, although we (OOC) allowed that to get through.
Yeah, but a tank can still mount more Miniturized Laser than a PA.
That creates an over concentration of force. If you're building two laser weapons you, ideally, want them on two
different systems due to the increased versatility.
Basically it's better to have ten Legionaries, or drones, with one laser each then one tank with ten lasers because while both options can concentrate their fire the former can
split their fire far more.
If we do invent Forcefield, a tank's forcefield will be tougher than a PA's and they can provide better cover for civilians and non-PA troops if the need arise. PA can too, but their bulk and sophistication general make them ill-suited as meatshields
I point you towards the Kasa Guardian Angel system:
Kassa Unveils New Guardian Angel System for Arc-Reactor Powered Armor
Paragon Industries' Legionary Powered Armor has an impressive power budget and Kassa Fabrication's new Guardian Angel System put that to even better use. Each pair of units is a high-powered shield generator that interfaces with the existing shield system. Not only does each pair add one and half time the base Legionaries' shielding ability, but the system allows for these shields to be projected. Thus the soldier equipped with the system can protect injured comrades, critical targets, or civilians. In addition it turns the soldier into mobile terrain allowing them to block choke points and prevent passage.
Each unit plugs into one of the legionaries' shoulder mount slots allowing for flexible battlefield reconfiguration.
As you can see in the section I underlined there is no need for physical meat shields to stand in the way.
Plus I suspect you can probably get similar shield strength but having multiple Legionaries project their shields in an overlapping manner.
I mean, we built an IFV that can can stand up to MBT, imagine what we can do with actual battle tanks?
I'm sure we could build an
amazing MBT. The question is if the MBT still has a role on the battlefield of tomorrow. I'm not entirely convinced it does.
But didn't we have meta-materials that can outright no-sell lasers?
I don't believe so. We do have Arcane Blur which
reduces the effect of lasers by increasing how much they scatter but I don't think we have anything that can, outside TIR which IIRC has serious issues inside an atmosphere, straight out no-sell lasers.