Opposition to the rambam can be used to justify every deviant idiocy – maybe na nachers are right, and if you say they’re wrong, then….what about the rambams opponents?
Was shabsai tzvi later recognized as valid? Or did he fall aside into the trashbin of history?
What about frankel?
And solomon shechter?
Most deviants who aren’t accepted, are never accepted later. The only three times it happened that someone was opposed and later accepted was the rambam, chasidim, and the ramchal (who is a bad example – he was only opposed because he learned kabalah at an early age in the wake of shabsai tzvi, not because of any particular teaching he had – so it’s not “shitas haramchal” that was first rejected and then accepted).
Every other deviant remained so.