Good casters and good bards are a gigantic threat, bad casters and bad bards are generally a non-issue and in some cases you can literally ignore a bad bard

There are a gigantic amount of casters that just try to blindly attack things and then complain when they wasted their oGCDs and are being interrupted, they dont understand the concept of setting themselves up to allow freecasting.

Bards dont normally have the luxury of building vitality without losing damage, a blackmage can build vitality which allows them to still kick out a staggering amount of damage and be extremely tanky at the same time