Thing is, I don’t think Snapshot has the manpower to do that. They’re already swamped with the basic build and all the balancing fixes that are currently needed. And as I said before, there are literally hundreds of inventive little players out there, all experimenting with never-thought-of-before combos that can break the game.
So, if it’s possible - and I’m not saying that it definitely is - Skills need some kind of universal limiter which means that you can’t exploit them with multiple stacks. To my mind, that involves 3 possible solutions:
Limit each skill to 1 use per turn.
Give each skill a Cooldown timer.
Increase the cost of every additional use - and to my mind that needs to be punitive, otherwise players will simply find a way of boosting WP with other Squaddies to stack it.
Some games use team limits, not more than x use in team per mission or per turn. I even quoted team cooldown, a cooldown team based, another soldier can use the same skill only after end of first soldier cooldown. The UI solution is basic once you have a system to show a countdown, it is just repeated on all soldiers with the skill.
Again, I just don’t think there are that many, and once they are found people post about them and they can be fixed.
Also, someone of them are connected to other issues that need to be addressed - like stealth and melee, or the fact that sniper rifles should get less accurate below their effective range.
IMO, going down this way the best solution is to just limit each skill use to once per turn per soldier, because everything else is just unnecessary obfuscation.
A different issue is the incremental WP tax, which I think could be used as a safety net for some exploitive builds involving rapid clearance and dash, and could also be used to increase the difficulty of the game.