I put in a nerf for the jester costume! (Classlead 707)
Not the solution that I would have used.
The Jester costume was added in order to balance ranged bombs, things like pet delivery of shard bombs. I would change the costume to 100% negate bombs arriving from other rooms (thrown, dropped from the sky, or delivered), but make it ineffective against bombs dropped on the ground or given to someone in room.
That would still give bombs a purpose, but it wouldn't be a ridiculous one like it was pre-costume.