For better or worse, he’s mostly know in the “street/urban art” world (which is much bigger than graffiti). And one of the features of a lot of the art in that scene is high technical mastery paired with “low” / populist motifs and composition.

That's an interesting distinction. I hadn't really noticed that but it makes a lot of sense.

I suppose Banksy would be close to the crossover point between those two worlds? The ideas and the chutzpah are the main attraction, but generally 'low' populist motifs, without high technical mastery. Someone you could either look up to or sneer down on from either side.