I didn't leave it out on purpose (as in I didn't (i) bring it to mind, then (ii) choose to omit it).I don't disagree with your post, but was leaving out the idea of GM as in charge of the rules an intentional omission? It's not part of every TRPG, but it's pretty explicit at least in the versions of D&D that I'm most familiar with that the GM is the last word on the rules--while still in principle being subject to them, which seems at least a little conflicty (but that's probably best left as a different discussion). That at least seems to be a difference in authority that's greater than the difference in (to use your example) Monopoly between the Banker and the other players.
But I don't think it's a coincidence that I left it out. Because even for very traditional D&D I think the idea of the GM being in charge of the rules tends to be overstated. When you look at actual empirical cases you see players make rules calls quite a bit.