You can't argue with this sort of reasoning because you made it unfalsifiable.
I strongly suspect that people who care a lot about balance strongly suspect everyone else does too.
I didn't make it unfalsifiable, it simply is unfalsifiable, AFAICT.
And talking about "caring about balance" is, with respect, missing the point. The player in question didn't and doesn't "care about balance" in the sense that he would suggest we play a more balanced game, let alone complain about someone else's PC or something. He's an interesting player, both committed to his characters and engaged with the game, but not always engaged with the mechanics. However, 4E allowed him to engage with the mechanics and to play a character who was highly effective in combat and yet also fit the tropes he enjoys in characters.
Re: Wizards being "nerfed" since 1E I see where you're coming from, but I think power is always relative. In absolute terms, a 1E Wizard wielded a lot of power, but there was, imho, a much smaller differential between him and say, a Fighter in that edition, than in 3.5E/PF. 3.5E/PF is regarded as the peak of wizardly power because that's when it became easiest to cast spells, and a lot of them, and many of them were as or more effective than 1E/2E versions (not all, to be sure), and you also had the most "certain" path to power in that you could pick more spells, the rules on spell acquisition were arguably more generous and so on. To be fair I didn't play 1E, I've only read it. I started with 2E. In 2E we did notice an LFQW-type effect, though we had no name for it. But from about L9 onwards the Wizard-types (particularly Specialists) grew massively in power as other classes sort of ground to a gradual halt, which I always thought was a curious design choice. In 2E it was mitigated by quite a few factors, and in particular Warriors, felt stronger compared to Wizards relative to their 3.XE/PF versions. With 3.XE/PF the difference became increasingly starkly obvious (perhaps the most bizarre and unnecessary balance error was iterative attacks being at a penalty).
Agree with your ordering of editions re: wizard power otherwise.
Interesting re: not finding 5E playable even as a player? Is it possible for you to give a concise explanation of that (or point me to a previous explanation)? Understand if not, am not here to criticise, but that's interesting as I felt like 5E was very like 2E in a lot of regards.