I enjoy classless. I started on Red Box D&D back in 1982 (I think) and it was an absolute revelation for me and a foundational moment for my entire life's 'hobby' compared to the computer adventure games I'd played up until that point (The Hobbit, Colossal Cave, Zork, etc). But a few short years after that I was introduced to Runequest and D&D just seemed like a child's game in comparison. Again, I want to make it clear I'm not dismissing anyone else's game. If D&D is your one true love then that's awesome and I'm glad you love it and hope you have many, many more years of gaming enjoyment.

But I, personally, found the class system and the level system just too artificial and not reflective of living, breathing characters. It felt (to me) like a cartoon version of role-playing compared to Runequest where PCs were deeply, and fundamentally, embedded in the game world, and the limitations on them were in-game, world-based limitations, rather than game system limitations which were not a natural outcome of the world, but of the arbitrary decisions of the game designers. I'm thinking 'woshippers of Humakt (the RQ god of Death) can't kill people who surrender' vs. 'magic users can't wear armor' kind of limitations.

I want to stress, once again, I'm not trying to shit on any one else's game fun. The more people playing TTRPGs the better as far as I'm concerned.