pretty sure they provide political points
We have no guarantee of that. On the one hand, they're conspicuous symbols that Treasury is Doing Something. On the other hand, they're gigantic land battleships trundling along and crushing the land beneath their tracks in the relatively small, crowded Blue Zones where our population lives.
Not sure we'd win Political Support on net that way.
The GDI already has the tech to develop hovertanks , though we will have to spend research dice to develop a main battle tank hover craft
Yes, but our existing hover technology is vulnerable to ion storms. Bit of a problem there.
So we will be getting a Juggernaut upgrade action down the line then. Probably when we have enough artillery shells.
You are making an assertion without evidence.
The Juggernaut uses gigantic large-caliber artillery guns; it is not similar to the tube artillery we've been mass-producing. There is no reason to think that the limiting factor behind an upgrade is "we don't manufacture enough shells." There is, for that matter, no reason to think
the Juggernaut will continue in service for the bulk of GDI's military, because it's not clear that it serves a purpose anymore. We have ample conventional artillery and are working on MLRS systems for further bombardment options. We developed those artillery systems in large part
because of the inadequacy of the Juggernaut, which uses oversized guns and is too expensive for Ground Forces' purposes.
Ground Forces may continue the Juggernaut in service, or they may not. The Steel Talons will probably work out an upgraded version for themselves, but that doesn't mean it'll enter mass service any more than the Titan Mk. III is going to.
It is an upgrade to the factories and may net us something more to do after completed.
The factory refits are very specifically intended to increase production, not to alter the design, and the Firehawk is being explicitly singled out as an aircraft that is
NOT likely to change or be replaced soon.
You are speculating baselessly here about the Firehawk.
You are overlooking two important things:
1) Every piece of Tiberium harvesting we do will at the bare minimum give us 1/5th of it's gains permanently (so we want to build up Tiberium harvesting to the point where we have 700*5 = 3 500 income to be able to use all our dice regardless of budget) so there is no reason to stop all Tib mining and we should start Blue Zone Tiberium mines at this point so that we don't have to play catch up when the mutation hits. We should leave glaciers specifically for the next plan to get more income sooner when we start it, but the rest of Tib mining should still be built up both for gains and abation so we decrease the amount of Tiberium infestation as much as we can.
2) MARV Hubs don't just provide abation and resources. I mean in the Red Zone they do, but we know that in the Yellow Zone they also provide Labor over time in exchange for Housing and we have no idea what they provide in the Blue Zone. We will need to build up the Yellow Zone MARV Hubs for the Labor gain soon, but that is a concern for the next plan. Although if we build up the military fast enough under this plan I would recommend finishing the Hub in YZ 5b.
I am overlooking neither of these things.
For (1) you are missing something
very important: resource efficiency. It is a bad idea to expend large amounts of resources in exchange for a small return on investment. We cannot build up unlimited tiberium mining infrastructure; there is too much else that needs to be done. Thus, we need to be
selective.
Certain projects are particularly useful for abatement (such as
Red Zone Containment Lines and
Yellow Zone Harvesting). These projects make sense to pursue at any time, including now. Sure, we lose a lot of the resource income they provide in the near future, but we don't lose the tiberium abatement, good enough.
Other projects are not useful for abatement, as they provide very little, but do provide relatively large resource income (such as
Glacier Mining and
Tiberium Vein Mining). These projects should
not be undertaken at the end of a Plan, not only because we're relying on them to surge our income back for the next Plan, but because they have large up-front costs of Logistics and Capital Goods (respectively). We are short on those resources and have to work very hard if we want to build up substantial surpluses of them.
Tiberium vein mines simply do not provide enough mitigation to matter much, and the Capital Goods cost is crippling.
We cannot afford to build them on a large scale. Not now. Just because the action has been unlocked and exists, doesn't mean it's feasible for us to do much with it at the moment, when we so urgently need Capital Goods and are still far from completing any of the megaprojects that give us massive amounts of them.
...
As for (2), the Yellow Zone hubs are not our only source of labor- though they help. The problem is that they have to be finished very quickly for fear of a military disaster. We may want to pursue them, especially if we can get Nod on the run in certain Yellow Zones or break the power of specific major warlords, but by nature each one is going to be risky and draw a lot of Nod aggression.
And I think you
greatly overestimate the value of Blue Zone MARVs. It's conceivable that they do something much more useful than we have evidence for, but it's also conceivable that they're not useful. Think about it, the MARV was specifically designed to operate in Nod-infested Yellow Zones and into the Red Zones. That's why it's so big and heavily armed; it's not to make the thing more efficient as a tiberium harvester, but rather to make it
defensible in areas where conventional harvesters would be vulnerable.
In the heart of our fortified Blue Zones, the MARV simply does not serve the same role- because it's not worried about attack by enemies and isn't in such a hostile environment. It becomes less efficient than its weight in conventional harvesters.