This is a claim that several people tend to make, but I do not recall this ever actually being the case. You make it seem like it was Wizard players that sounded the clarion call to people not accepting 4E-- like the game's failure was their fault because they didn't like the "balanced comparison" between the Wizard class and the Martial power source. But I don't think that is true at all.
ALL types of players did not like 4E. Not because the Martial and Arcane power sources were now more balanced to each other... but because the 4E game play itself and the focus of the grid-based combat game play was different than what players expected or wanted. There were plenty of people who LOVED playing Fighters who HATED playing 4E because of the way the game of 4E played. And the loss of so-called "Wizard power" had nothing to do with it.
And there were plenty of people who LOVED playing Fighters and finally loved that they were actually getting power.
We can duel these things all day. Nothing will change unless, y'know, we actually do something about it, rather than just pushing "status quo with grace notes."
Quite frankly... over the past 20 years I have heard MANY MORE "Wizard haters" constantly complaining about the power of Wizards than I ever heard of Wizard players "rioting" or even merely complaining that in 4E they were "less powerful".
Then, frankly, you haven't been paying attention. I know of no other way to say it. It was everywhere--
even here.
And to be honest... if all of (general) you Wizard haters haven't rioted yourselves yet about Wizards being supposedly overpowered... it is quite a leap to state that is was the Wizard lovers are the ones who did.
Do you see people stating blatant, open lies about what 5e contains? Or 3e? Come back to me when you do. I'll be waiting.
It would be nice if some of these people who complain that fighters are not as powerful as wizards would just play a wizard already! My experience is that wizards are in short supply, but fighters are a dime a dozen.
I have--at least in BG3. They're extremely annoying to play, in part because:
1. You always know that you could simply be the continuous MVP if you just blew through all your spell slots and then long rested once you were out,
2. It's incredibly tedious to keep track of all the stuff you can do, but that's exactly what makes it so potent
3. Even if you enforce (as I do) the tabletop rule that you can only change your spells once at the start of each day, picking a smart handful of spells is almost always enough to get through literally every challenge you might face--combat, social, exploration, the works. Ritual spells are particularly potent in this regard.
I don't like playing Wizards because they're boring (and often tedious) if played well, and annoying if played while intentionally hobbling yourself. (Well, that and the class is objectively garbage at delivering on its class fantasy, but that's a whole different thread.)