M&B comes across as being a different game for different people. Callum probably didn't RP much when he played M&B (wasn't he mostly an MP player anyway?) and he said that was just his opinion. Other people say they played it like an RPG and little niggling details destroy their ability to immerse themselves in Bannerlord -- like the relations being only a number instead of a word or changing the village elder's title to headman.Those complaints are caused mainly by TW not providing an honest and clear answer into what their overall vision for the game is. From the things that are suggested time and again, we can see that people expect more RPG elements to be added, but if we look at an answer from Callum in some thread we get something like "Bannerlord is an action game with a sprinkle of RPG elements", the problem is that it is just some comment not an official statement.
I play it like TW (edit: Total War) but with the ability to personally dive into battles.