It occurs to me looking at this and the other responses so far in this subthread - that it's quite likely more common in larger organizations (Google/Microsoft/Amazon/Intel) where career advancement is not quite so directly correlated to "leaving for a better position in a different company". If you can get your best employees promoted into roles where they are likely to become your reports again when you yourself get promoted, there's more benefit for the manager in advancing people they want to keep "on their team" as they themselves climb the career ladder. There is, I guess, less opportunity for that sort of mutually beneficial career development in startups or SMEs (with the exception of the occasional "freelance teams" that you sometimes see all jump ship from one project/startup to another together - I've seen that both in tiny hardware startups as well as in 9 figure projects in major corporations.)