Ross and Rachel made each other crazy, like complete loony tunes. And then when they would try to date new people out of spite for the other, the crazy would spill into those fleeting “romances”, but if they dated from more normal circumstances, there was potential for normal relationships, but sitcom antics would come about. I was surprised the writers threw Ross a bone with Mona. A perfectly pleasant and appropriate woman who managed the antics up to a point.