I could see them change the spell that lets you take 20 on... so many things - maybe fix what they'll think are the most egregious issues (Vorpal ? who knows).
I didn't think that spell was all THAT bad, except for Vorpal.
Oh wait, it was persistable, wasn't it?
Stack. Of. Twenties. Someone that I respect (can't remember which big name it was) made a build:
Monk 1/ Artificer 19
The whole point was to persist that spell, make your foot vorpal, and one shot people. Not a full write-up, but the presentation had style.
I don't see how that would work. The text explicitly says, "Using this option instantly ends the spell." So, even if you Persisted it, the new 24-hour duration would end once you used it to automatically roll a 20.