It's not... MoD is the only tower where the defending guild is at a disadvantage.

The spawn point for the defenders puts them an entire ~5 tiles ahead of the attackers. Think about where defenders spawn at every other tower. The defending guild has one set of stairs that they can access, while attackers have two. A single person can block the top stair and prevent 5+ people from accessing it, forcing them to go all the way around.

The top stair does need to be widened, and even then the advantage for the defending guild is slim (if even at all). Any tower strategy that revolves around the idea of standing in a choke point and AFKing until your full blink time has passed is kind of stupid to me.
It's a really simple change that wouldn't effect the tower in any way other than stopping single players from causing an entire guild to lose the tower.