Of course a woman can NEVER be hit or starved for not obeying her husband certain aspects of halacha change with time.
The rambam lived in a time and place were wife beating was common and even condoned
The halacha also is that a father can marry off his 9 year old daughter i think that anyone in there right mind would agree that any father (and the person who marrys her) who does such a thing nowadays should be locked up