> and then leave once the interesting/challenging work is done.
Don't underestimate constructive dismissal.
The courts have begun to take a somewhat dim view of executives being completely ignorant of Too Good to be True scenarios, which has been a viable form of plausible deniability forever and a day. I'm not treating the workers badly, George is treating the workers badly. George, who I brag about all the time and have promoted three times in five years.
There's this sort of notion of 'what have you done for me lately?' that pushes us to underappreciate people who set up systems that usually run on autopilot. Bosses can't absorb the idea that just because nothing has broken doesn't mean it won't break, and these may be the easiest plates in the world to spin but they are in fact spinning, and so this person who "doesn't look busy" is doing so on purpose. It's what some clever person called "on-site on-call" to differentiate doing nothing from actively doing nothing. It's very reminiscent of the experience some people have buying someone a gift (a subscription, a car, etc) that has an ongoing cost and then they hear from the person how disappointed they are in the new/other gifts they got. "Last year they bought me a car and this year all I got was a new iPad." No, this year you got an iPad and your rich uncle is still paying for your car, you little shit.
Steve may be maintaining systems that save us 4 headcount, but he looks like a cost center to the business. He's lucky we don't lay him off, so don't talk to me about giving him a 10% raise for boosting that to 4.5 headcount.