I think it's a little of column A, a little of column B. The devs didn't like how arcane spellcasters dominated BG2, so they set out right from the beginning to stop that train before it could get going. Then they saw widespread reports that Slicken was OP (and it was, indeed) so they decided that needed nerfing as well. To be honest, I can't argue with them that much--a 1st level spell shouldn't be dominating the entire game to that degree, especially after the 1st level spells become per-encounter at level 9.
The problem is that right now the Druid will soon be doing literally everything better than the Wizard. Sure, the Wizard still has Confusion and the like, but it's not nearly as spammable as the Druid's very nice level 1 spells (which lost no utility in this upcoming patch). Sure, you can say that it doesn't matter as this is a party game, but my contention is there will soon be precious little reason to choose the Wizard either as your PC or as a party member (Aloth or hirelings) when the Cipher and Druid can do just about everything better.
the cipher might still be inferior just because his resource mechanic is not as suited for spamming down people in really important fights.
the one thing that irks me about poe is that there is no replacement for the priest, druids are 80% wizard and paladins are 80% fighter. priest is basically its own singular class/role and that kinda gives me a sad.