But, I mentioned this earlier about what if you had a caster with a list of 20 spells total for their spells, same as a Battlemaster has only 20 maneuvers. Let's split that up over 9 levels:
1st (4 spells) - Expeditious Retreat, Jump, Shield, Thunderwave
2nd (4 spells) - Alter Self, Invisibility, Knock, Scorching Ray
3rd (3 spells) - Fear, Fly, Fireball
4th (3 spells) - Charm Monster, Stoneskin, Ice Storm
5th (2 spells) - Cloudkill, Telekinesis
6th-9th, 1 spell/level. - Circle of Death, Plane Shift, Earthquake, Meteor Storm
((Note, taken from the 2024 Sorcerer spell list))
Now, there's the benchmarks. That's what a fighter should be able to do, without magic, although a supernatural or whatever you want to call it source is fine. No actual spells. Just using his weapon/spirit/whatever, the fighter or rogue can duplicate THOSE effects. So, instead of needing to be 14th level to fly, our fighter can do it at 5th. Our fighter can slam the ground so hard to cause earthquakes at 15th. So on and so forth.
If we're going to get class parity, this is what needs to happen. Or, we need to drastically reduce what a caster can do. Either way.