Sjs, why do you keep trotting out that untruth as your only retort? Rambam never allows beating a wife. He does say you can take her to BEIS DIN if she doesnt do her duties for him, and THEY can HIT her (not “beat” her) IF she remains stubborn and continues to refuse to listen to beis din.
Beis Din can also hit a man who refuses to listen to it. (Not even for a maalkus punishment.)