A common reframe in the old school landscape is "Combat as War vs. Combat as Sport," often used to negatively contrast elements of 5e and particularly 4e concerned with encounter balance an "the encounter" as a fundamental unit of game action in general with the old school. Without getting into the merits of how this argument is typically framed, I think that even if we accept this as true, there is a way to lean into those elements of modern D&D and come out with something cool. Instead dungeoncrawling for treasure (mainly), maybe the dungeon environment could be the battleground of a big tournament.
X-Crawl deals with some of this territory, I guess, but from what I read of it, it is set in the modern day, and seems very much concerned with the celebrity aspect of things, bringing in a lot of professional athlete cliches. All well and good, but I'm more interested in something more like
Dragonball Z. The fighters are in it often for the personal betterment--a personal betterment that is practically apotheosis, which dovetails nicely with D&D advancement. What if the gods or Immortals or whatever design the dungeons as tournament grounds, and foundries to forge new Immortals to join there ranks?
In this context, the lack of XP for gold makes perfect sense. Also, "levels" of dungeons are likes brackets of a tournament. In order to give a good spectacle, you don't want scrubs advancing to take on the contenders too soon. Mainly playing this sort of setting would just mean thinking about the game differently. The only change might be that there would be fewer nameless rabbles or humanoid tribes with young and the like. Everybody in the dungeon is playing the game.