But the point you alluded to is a good one, all the same.
I have seen it (in a number of cases) myself:- and, no doubt, have mentioned it a few times before - "bright young things" (fertile young minds) come along to the workshop, full of confidence (fair enough), full of their own self-importance (not so good), and also full of [censored] (
ditto) ... but armed with bits of paper suggesting that they are Bachelors of this, and Masters of that - then, the next thing you know, they are either pushing the Old Sweat *Manager out of the chair, or (and worst yet) scheming to get the Old Guy put out to graze.
Like you, perhaps, I could recount actual cases where
scenarios like that have actually been played out.

To my mind, stuff like this is just another "unintended consequence" of the New Utopia where "everyone must go to University".
"Too posh to push" also comes to mind, for some (probably warped) reason.

*
Who has of course, come up through the ranks, as it were.