I tend to agree re: pulling casters down. I think we could elevate martials a bit, just with some more interesting ability design (without necessarily going "full superhero", just like keeping it in the literary fantasy/action hero zone), but the top end stuff with casters, and really anything above level 5 spells gets so dominant that it can very quickly become the focus of play even in 5E (especially given the sheer number of spells they can cast at that point). So I think slower progression of spell levels and capping spells at like L6 or L7, and just reconsidering every spell above that level. Really direct combat spells weirdly are not the main issue, it's all the rest.