What do you mean? O_o
There is many things that Bards, Paladins, and Monks do ...
There is also many things that subclasses that so far was not released to EA have ... just take channel divinity spells for different Clerics.
I mean unique features - like metamagic was unique for sorcerer or they revamped throws for barbarian. Like if they revamp reactions then bard makes sense as a next class, as from what I have heard it relies heavily on reactions.
For example, if they implement palladin's smite using the system similar to one they use for fighter's superiority dice, then it is not a unique feature - Larian already tested it through fighter. Same with channel divinity - it's already implemented. It does different thing for different subclasses but I assume thgre isn't really much to test there - just more variations on offer once 1.0 drops. I am not well versed in 5e, so I can't tell from top of my head if palladin had any unique systems - from my Solasta playthrough I don't remember anything particularly unique, aside from reactions.
Looking at monk I can't see much that I count visualize being added using features we already tested. Partial defence stands out mostly because the game doesn't have "dodge" function.
I am not saying that Larian shouldn't test other classes, am just theorizing that maybe they don't have to, if they build them using the same tools they used for other classes. If there is something you are aware of that is really unique in other classes, please, let me know what it is. I don't remember D&D classes having unique gimmicks the way they do in PoE.
Larian adapts well known and well tested system, so they probably prioritise testing things they change rather then things they keep as they were. Multiattack is at the very top of the list of things I would personally like to take a look at, assuming of course they won't implement system faithful to 5e for release.
