Just a bit.
But to be serious, I’m not sure what the Rambam’s learning or not learning has anything to do with TuM. If the fact that the Rambam didn’t study American History is meant to imply that neither should we, then we should all study Aristotelian and Platonic philosophy, Islamic jurisprudence, Greek medicine and astronomy, and Roman histories because the Rambam most certainly did study those disciplines.
(Don’t get me wrong, Greek philosophy, Roman histories, and Islamic jurisprudence are great – but I can’t speak to Greek medicine or astronomy since I’ve never studied those myself).