Interesting points. One thing that is currently lacking in the unit chains is advanced strike teams around that era and beyond, upgrades that would normally make them a slight enhancement rather than a GREAT one. They will be more easily balanced once that core is completed. I can see them currently being overwhelming. Build by everyone? Perhaps... It's certainly something a prehistoric building may be too much to expect will still even matter by then. Will consider this further. Another factor is that units themselves aren't all that well balanced by this time in the game in general and many balance points of various counter-unitcombat modifiers and so on have not been so far well plotted out, which is a part of what's getting established in this unit planning. It's my hope that they won't seem so overwhelming at that point, though the stealth factor may be pretty impressive at that stage and it's possible the AI isn't staffing good enough visibility units to see them coming and thus easily gets overwhelmed by the little ninja cat people. I have previously done a chain of upgrades map on Felines but I'll be considering them again further soon here so I'll look for ways to tame them a bit as well. Thanks for the observations on that and drawing my attention to it as a problem spot for deeper consideration.