If you look around over the last decade you will find a lot of people who outright state that moving away from that hurt the wizard by giving them buffs that had nothing to do with their gameplay niche forced the down-tuning of their spells just as giving meaningful at will unlimited cantrips were a shift in power budget away from the core competency of most spellcasters in order to bolt on support for someone else's roleThere was another thread that tempted me to post this, but it feels more at home here.
In 1e Wizards were pretty awful at everything but spells. Bad to hit, d4 hit points, no armor. Imagine taking a real world stereotypical librarian or chemist (who didn't have a background of like being ex-military or mixed martial artist) but giving them a spectacular limited set of things they could call up once in a while, and then sending them off with the crew from Predator.
What if the full caster wizard with the current spell list went back to that - d4 hp, really bad to hit, etc... And then if someone doesn't want to be a complete glass cannon they should spend some levels multiclassing and getting trained in something combat useful.
Or, if that would be an unfun trap class for most people, put it in the DMG and make the default be a 3/4 caster and put that in the PHB.
Doing that would also give the sorcerer room to be a less incredibly squishy ¬ as dedicated but still mostly competent spellcaster who is still meaningfully behind the wizard in enough areas for distinctiveness.