I agree, this is indeed very wise. There's a second sort of form of this: even if your (first) goal isn't to make changes, but just to maintain what you've got

I agree, this is indeed very wise. There's a second sort of form of this: even if your (first) goal isn't to make changes, but just to maintain what you've got (operations, reactions to security issues, keeping up with the new Android/iOS/Windows/Web 99.0 way of doing things) you might need a team of a few people. But they won't need to be doing that 100% of the time. The work will come in spurts. You'll find something to do with the time in between, because you can't hire people just for the spurts. Thus sometimes-BS jobs.