To be fair, I would expect this is at least communicated in-game, as the affected buildings will visibly not be in your territory.
depends. if the borders are close enough one might not notice.
the fact that this thread even exists makes it clear enough that the game DOESNT communicate it in game, or at least not well enough. if i own all the territory around the building im not going to stop and think "maybe the map maker doesnt like this ability that this commander that i purchased is built around and made it so it cant be used as described because of that"
i think beyond the obvious, inconsistency and lack of communication the thing that irks me is that mapmakers are not there to balance the game based on what they like or not, that is the job or the balance team and making it so entire commanders are neutered because they dont like it should disqualify those maps from being accepted into the official map pool.
maps designed specifically for certain abilities to not work have no place in rotation. personal balance belongs in mods, not in official maps.
if i decided to make a map and decided i didn't like heavy tanks and made the ingress for units too narrow for heavy tanks to be called in because i personally feel like they have no place in the game
or perhaps a map design that has streams through it that disallow mines or buildings (like emplacements) to be built because i dont like them would be equally unacceptable into the map pool
and especially if there is no information on this in game then that map has no place in rotation because no matter how
I feel, they are part of the game and its not up to me as a map maker to decide which abilities are and are not allowed in the game. dissuading certain abilities is one thing, outlawing them entirely is another and sets an awful precedent