I have never heard the term minarchist. Many anarchists say, we need structures against the building of hierarchies, like avoiding knowledge hierarchies by doing skillshares.

Natural authorities are a different topic. I think Kropotkin was an example of a leader who was accepted because everyone agreed with him. Once he said something people didn’t like, they rejected him as a leader. You can call this a hierarchy if you like. I wouldn’t because he couldn’t coerce his followers but this is pure terminology.