My #6):

Not "letting go" to be a manager, which turns them into a micromanager. I got stuck under a brand new Engineering Manager in what is effectively his old role during the last reshuffle, and he still has to be intimately involved in every aspect of every project because it was his job. Every minor decision goes through him and I don't think I've attended a meeting in over a year where he wasn't part of it.

Between other issues with #3 and #4 it's a nightmare. I've been bringing up these issues for most of that time (it's gone from diplomatic to brutally honest over the last few months) and nothing changes.

Thankfully the job market is starting to rebound after tanking during early Covid.