There's a metric manure-load of tripping. You can build for a LOT of prone.
As for disarming and sundering.... good riddance. More headaches than fun, for all of me. And you have multiple ways to reduce someone's defenses or damage that are for all intents and purposes the same effect, but easier to adjudicate and with lesser chances of completely trivializing an encounter or destroying a PC's effectiveness for an entire adventure (i.e. sundering the weapon specialist's weapon).
Subdual damage, too, is just unnecessary bookkeeping, since zero hit points is really just unconscious if the DM or players want it to be.
I can see how people who wanted very specific niches served might be irked. As you say, bug or feature depends greatly on where you sit. Clearly I sit on the side of a small number of relatively generic conditions with liberal refluffing to explain them if you like such.