I think this thread is very good. If I have the premise correct it should help to fix the problem of the caster at high levels being godly and the level 20 Barbarian being a guy at the gym. When you try to answer what do level twenty versions of each class look like you help to see if each classes paragon could actually be in the same story. How do you find ways to make Batman and Superman be in the same story and feel relevant. I can tell you it’s been done. I can also tell you it’s hard to do well.