The whole "you can house rule it" is a cop out. If you have to house rule something to make the game work, the game is messed up to begin with. We didn't have to house rule anything to limit a magic user's impact in 1e, since the rules themselves, if followed, made casting in combat difficult.
3x, and, after they had a chance to fix it but didn't (and basically banned everyone who was mechanically correct but rude to the "we can just house rule it" cheerleading squad), Pathfinder, has the imbalance built in. 3x took away every mechanical limitation to spell casting AD&D contained, and took away a lot of what made non-magical characters competitive.
I hope they decide they don't need to be restrained by "backward compatibility" when Pathfinder 2e becomes necessary. Maybe they can actually fix everything (or at least a lot of) what was wrong with 3x.
The system actually has a lot more balance than most people realize. The biggest thing they need to do with PF 2.0 is rework the feats (not the feats concept, just the feats themselves), rework the spell lists for what each class gets (again, just the lists; most of the spells themselves and the core system is actually not that problematic), and completely reorganize the books from scratch. 3x has most of mechanical strengths and limitations that late AD&D as it was actually usually played had, they just completely botched most of the presentation, hiding the previously clear stuff unnecessarily and burying the previously hidden stuff even deeper. Reworking the spell lists to fit the assumptions made in the rest of 3rd edition rather than holding them to the assumptions of the original classic party would get rid of a lot of the lingering problems that PF inherited. Streamlining and reorganizing the book would take care of the vast majority of the rest, leaving a pretty solid system that could be fairly easy to pick up the basics up right away and learn the rest as the campaign progressed.