In fact, a king does not have that much freedom, and if we take into account that this game is set in the medieval period (to a certain extent, of course), it is necessary to analyze that a king only remains in power if he manages to please his army and his people.
Taking another historical reference, the list of emperors assassinated by the Praetorian Guard is quite extensive, and this happened, in some cases, because certain leaders simply did what they wanted without taking into account the opinions of others.
So if the dev takes these aspects into account in order to make his game more believable, then I think that simply "doing whatever you want and screwing everyone over" will generate consequences at some point in the plot.