In the private sector, as you probably know, shared assistants are popular. The one I use also works with three other supervisor level people. Also, in the private sector, most supervisor level people are also expected to do actual work. In my case, about 3-4 times as much actual work as supervisory duties.
Depends on the industry. I’ve always looked upon it as:
20% of your clients will be needy at any given time, while
80% are on autopilot. If those 20% are always the same, time to get rid of them...