I still see my Academy as very useful and I'm certainly not going to delete it. But it should be deletable. In fact, all buildings except for the townhall should be.
I think this would cause some balance issues. If players
can delete their barracks, they'll free up a lot of room/culture/pop, and therefore be able to build more goods factories. So to counter this the devs would probably increase the negotiating costs across the board, or future guest race space requirements etc. which would hurt any player that doesn't delete the barracks(or MA as OP suggests)
Would you mind explaning why? If you find the MA useful just keep yours. Why do you care that other players might choose to remove theirs?
Sadly it doesn't work like that in Elvenar. Any player having an option to do something means the game must be balanced around that.
Just like with cycling quests, because players
can get obscene amounts of supplies by declining quests, the supply cost of everything is jacked.
The devs and the players are in a tough place on issues like this. Any closing of loop-holes, or reduction in strategic options is met with huge backlash from the players, and any new ways to play that are suggested by players come with harsh counter-punches from the dev to prevent new loopholes from being created.
Another example of this is the tournament update: Players wanted a way to get to #10 without doing 25@6x6, so the devs made it possible with 25@8x5 or 25@11x4,
but with quadruple the troop losses.
It's getting pretty obvious that they have a very different view of how hard some aspects of the game should be, and aren't going to move very far(if at all) from their position. I'm actually glad they didn't implement a timer less than 16h for tournaments(the most requested change) since it likely would have come with another doubling of costs, or worse.