I think that the research tree overall a much better system than the Campaign system … however, there are a couple things I would like to see.
1st: I would like to see the squad icon, changed to show the squad type itself (ie the engineer squad would have a wrench icon alongside the squad icon)
2nd: I would like to see tiers used more effectively. Essentially When you have 9/9 Tier 1 trained (or bought), you may start training Tier 2, even if you don’t have the full requirements. The prereqs should be Tier only. This would also remove the issue of early additions blocking progress to later levels.
So for example: If I train the following 9:
I can then start training the circled Tier 2 and begin working on Tier 2.