I've still never heard someone explain to me why it would be unfair if they could only call in 1 per game. It's literally an extra commander ability that makes your commander decision MASSIVELY less consequential. I'd prefer the 1 per game rule over adding penalties.
I get that being able to build more than 1 is mostly a team game problem, but I think it could make 2v2s (my most played) a lot more interesting. Very tired of long matches yielding multiple KTs from one player.
it would be fair if:
1 they make it cost only MP
2 they buff it accordingly (hp, move speed, armor, reload, accuracy)
3 they reduce the cost and requirement a lot
right now kt is strong but is still easy to counter with kitting (especially with the repair speed Nerf)