I said this in another thread but I thought it would be fitting to add here.

I actually think most clashing and fuss occurs between types who have contrary leading elements, like an EIE and an EII for example and perhaps even between mirage types as well.

The leading function is the most stubborn and outwardly directed function. When you have two people with contrary leading elements this can lead to never ending battles on both sides. Easiest example I can think of is Si vs Se. Se leads tend to willingly go around creating a ruckus which bothers Si leads. The Si lead tries to stop the Se lead from disturbing the peace but the Se lead won't stop because of the stubborn nature of the leading function. The Si lead won't stop trying to stop the Se lead either and this creates the perfect condition non-stop fuss and arguing. I could go on how this could apply to other contrary types as well.

Issues with the HA/polr don't happen the same way as this. The HA lacks the same sort confidence as the leading function to be able to openly oppose others who use the element contrary to it (polr). Its mostly only in situations where a person is expected to skillfully engage in their polr themselves that it becomes an issue between themselves and others.