Ratskinner
Adventurer
Like JohnSnow said, above, it's not that I want fighters to be wuxia warriors, or that I want magic-users to be little better than stage magicians.
I want their to be some equal footing in terms of just how legendary/powerful types of characters become.
I guess many others do not want that. For many players, they like that casters, especially wizards, become the most powerful figures in the game. That works in some campaigns, especially ones where their is a lot of intrigue/politics/roleplay outside of combat.
However, the core game is about combat and quests, and if a game continues that way into higher levels, high-powered casters (as in earlier editions) dominate.
I think of some games I have run in 2e and 3e. I had low-level and mid-level campaigns where there were no casters in the party, or maybe just one. They could handle adventures with little difficulty. In the high-level campaigns I ran, I had parties consisting entirely of casters, or 50/50 casters and warriors. Without fighters, the casters seemed freer to blast away (no friendly fire accidents). With fighters they "helped out", but the casters were the determining factor in every important fight.
Heck, in running a 3e version of Return to the Tomb of Horrors, the final battle against Acererak came down to him and sorcerer duking it out with wish spells. The sorcerer had more wishes, and therefore won. Cool stuff! . . . unless you were a player with the barbarian who just went from encounter to encounter waiting for the casters to win.
I personally don't have a problem toning down spellpower, at least in the basic/core game at low-mid level. I'd also be perfectly happy if there was a module for the folks who like crazy-powerful magic. Its just that none of that has anything to do with the reason I started this thread.