"class relations can help structure a social environment": yes, it's like a map helps you find your way, even though the lines on the map aren't always there in the world (some of them are but some of them aren't)

"hero as class" -- isn't the thing with categorisation when you want to use a description to help move a situation from A to B, so you map A (to show what's wrong with it), and it tends to freeze it in ppl's mind as HOW THINGS EVER WERE AND WILL BE -- the useful idea of hero is that it is a story, ie an arc, a journey, a movement, it embodies action-towards-transformation (of self AND of the world), but can (like any written description) get trapped in the first roleplaying tableau (description as prescription)

so "hero as class" is brilliant if it gets things moving, but horrible if it causes things to get stuck