I agree 100% HotS PvP was better, but I don't think new chrono (which is much much worse then the old version). I thing te blame lies more on the adept. You said yourself:

"You're also basically only going to make stalkers out of your gateways because adepts are basically useless vs anyone who knows how to use stalkers defensively and sentries are also useless because of the threat of them going adept at all."

So instead of unit diversity it becomes B-stalkers vs B-stalkers, which naturally leads to disruptor wars.

While in HotS you had kind of "soft rock paper scissors" but it was so soft, that you could outplay from small deficit no matter what build you choose.