I think the people appointed to these positions think about themselves a little different than the rest of us. And I also think they’re bright enough to realize that Canadians will moan…and the GG will carry on without consequence
No doubt the adage 'the position changes you' can apply to some degree. I've dealt with a few VIPs; not GG, but a couple of LGs), elected politicians, etc. and a lot of times their more private personae is different that what is publicly seen, and a lot of times it is their handlers ('Klingons'). I met a lot more of them and some of them were truly self absorbed dicks. Their role of protocol, public relations, etc. is their life and, in some cases, lasts only as long as the VIP they work for.
It can take a fair bit of strength and confidence to do battle with them and win, and at some point they just say 'screw it - do whatever'. When we hear about excess or controversy, I'm wondering if it was a battle fought and lost or not fought at all. We didn't here much coming out of David Johnson's tenure, and he had been in a fairly high powered university leadership position so maybe he knew how to massage the established system.
The other angle for Simon might be that her predecessor bucked the system, astonishingly badly, and it didn't end well. They are dumped into a role surrounded by people who have been there longer and it's easier to decide that 'they must know better, two days ago I was an X".
On the other hand, it might simply be that some of them enjoy all the trappings of their role and enjoy soaking it up for their short time there.