You can easily play Classic without min-maxing. The game was cleared years ago with dial up internet, 1 core processor dell computers, and people clicking their spells. This notion that you have to min/max is one imposed by the community. That being said, the community isn't a monolith. There are guilds who don't do buffs, don't care if you use consumables, don't care if you play meta, etc. You'll have to search for them because they're not the norm and, odds are, they're not on sites like mmoc recruiting.
Personally, I don't mind using consumables and playing meta but having to deal with a lot of the people in Classic, like some of the people in this thread, just isn't worth it. Especially considering how damn easy the game is.