Well game is full of tc droppers . It’s counterable but very strong .
My solution is make buildings weak in cart mode , so that it can be targeted and kill by units of players try to maneuver building a lot .
That’s way if a player made some units It can kill tc drop . It will nerf the strat by making it easily counterable , without completly killing a strat .
Making magic area for not making building is totally bad . It will kill so many stat , it will completely kill stretagic tower rush , overall reducing available strat .
it will also weak England or mongol normal game as their units get buff from towers . Also some other civ get bonus with keeps . They will suffer if they can’t make forward buildings