As for kicking bards for intentionally gimping their damage? That's just plain stupid. A bard not using WM because they feel the dps boost isn't worth the downsides with it isn't instantly a jerk who wants to slow you down. You're looking at extremest and grouping everyone with them.

It's like saying tanks shouldn't be allowed to use STR accessories because that's not how they were intended to be played. Should a tank intentionally taking more damage and having less HP be kicked from the group for not playing as intended? No? Then neither should a bard.