Picture the following scenario: X finished his PhD. X is also quite rich and can support himself (as well as his research) independently.
What do you think about this:
Would X's time after the PhD be well spent if he would just work 'independently'? Would this make things more difficult for him if he ever wanted to move back to an institution?
Is it in a way, in this particular scenario, not actually a very good idea, to focus solely on research and not bother with teaching and all the administrative stuff? Wouldn't he be more productive? What would hold him back?
Note: I am assuming that X is in the Humanities, that is, he does not require a lab or anything & has access to a academic library / or has his own etc.