How do we handle the fact that a rich player group may all be outfitted in 'Vetts, while the poorer group can only field FAS's? How do we handle a group that can coordinate Engineering all the ships in their group, while it's competitor cannot? We chalk that up to playing the game. The same as we should those that can use any game mechanic better than their opponents. With a shrug.
What ever mechanic one group uses to amass forces, the opposition can use the same way. Balance at it's finest.
Except, as I've said before, it should TAKE TIME to concentrate such force, not be effectively instant once the first elements arrive. That's the gameplay balance that's being thrown out the window here. A wealthy group can concentrate heavy forces and establish dominance almost instantly, while a less wealthy group may not. Hence, such dominance and the outcome will be determined first by credit balance instead of more important considerations such as strategy, planning, effective coordination, and the length of travel distance for forces to come from. Now, for simple CG participation this may not be a huge problem - beta will tell us that. But what about conflicts between the Federation and Empire, which are surely coming? What about countering a Thargoid incursion? It should take time for forces to be coordinated and arrive but now all we'll have to do is travel quickly in our long range taxi and then instantly summon our combat ships. It inherently changes the dynamics of how such battles should be expected to play out, particularly in the early stages of the engagement. For 'gamey' purposes it might get people into the fight quickly, but does it make sense? I say no, it doesn't.
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But, thinking about it some more, I'm wondering if they've gone instant because they want pop-up, short-lived capital ship engagements between the Federation and Empire, and perhaps even with the Thargoids and they want players to be able to bring forces to bear, to be able to respond, in as short a time as possible. I still wouldn't agree with the instant approach, but it might explain why they've chosen that approach rather than a more substantial delay in delivery.