Dofi – here’s the Rambam you’re citing. It doesn’t say that the husband forces her, it says that the beis din does. And it’s not even referring to tznius, it’s talking about not fulfilling her domestic responsibilities. “Kofin” means “we” force her, lashon rabim.
שתמנע מלעשות מלאכה מן המלאכות שהיא חייבת לעשותן כופין אותה ועושה אפילו בשוט. טען הוא שאינה עושה והיא אומרת שאינה נמנעת מלעשות מושיבין אשה ביניהן או שכנים. ודבר זה כפי מה שיראה הדיין שאפשר בדבר
The Rambam likewise says that beis din forces men to fulfill their requirements to their wives.
Mod – my point was that force isn’t a bad thing in itself. Comparison wasn’t so great, but if something is advocated in the rishonim, who are we to say it’s objectively immoral? To be clear, i in no way think it’s acceptable in any circumstance for a spouse to strike one another, without exception, both because halacha doesn’t seem to follow those shitos and because it’s not only not effective but grossly harmful in our time.