True but isn't this with many factions? If Nilfguard is capturing your units there not a thing you can do about it. It's apparently not that kind of strategy-game you cannot respond at your opponent's action but do different thing like ignore it. Seems strange.
The thing is, managing your coins and spenders and at the same time reacting to what your opponent is doing is challenging enough. If the opponent could also mess with your coins I think the faction would probably fall apart.