Its all about power / extra endorsements for the FOI.
Its not about safety.
Nothing to do with safety.
Well, as a matter of fact...
It's all about safety!
I don't want to be sharing the FL's with someone who has no training or experience in the FL's. And nor does ATC!
Just have a read through some of the US incident/accident reports regarding high level piston/turboprop singles. Most ending in fatalities!