Fully agree. But do not forget that Wotc nerfed Mages with 5e. It is not Larians fault alone.
I have played wizards in every edition of DnD (well, from 2nd edition on) (Well....I mostly skipped 4th) and
1. Yes, they nerfed wizards a bit in 5e, but also boosted them in other ways. Personally I think the way wizards are done in 5e is VERY well done compared with other editions. In other editions of dnd, wizards feel next to useless at low levels but then accelerate to unstoppable gods at high levels. In 5e things feel much more even. Though frankly, even now, full casters outshine martials by a lot at higher levels.
2. What is wrong with BG3 is NOT at all a 5e problem. It is the result of a homebrew that is VERY generous to martials (which I don't even mind!) combined with totally absurd items, combined with many CC spells being outright nerfed, combined with *many spells being outright bugged.* In PnP, a level 12 wizard would stack up very nicely against a level 12 martial. Hell, they'd even stack up pretty nicely vs. Larian's homebrewed martials, nerfed spells and favorable rules for martials and everything (so long as you changed the "anyone can use scrolls" rule). It really is the outright bugged spells and the stupidly OP items that really push them over the edge.