Oh, I'm just talking about the lineage of the rules systems, there isn't really a good concept of "changing something from 4th to 5th edition" because 5th edition comes from 3.5. 4th is an offshoot really.

It does make some sense to ditch "quest" I think - partly because the spell can be "don't do (x)" and that's not really much of a quest, and partly just for simplicity in rules.