Until I saw hospital nursing, I had never seen a company run by HR.
Every decision starts and ends with HR. From hiring, to wages, to discipline and promotion, to IT and pay-roll, to reorganization and spending priorities, there is a rule for that. Maybe that rule originally came from the CEO or the CNO, but they say things like "may" and get interpreted as "shall" (or the manager faces a bad review and/or termination) or they are interpreted beyond any rational meaning. My best explanation is that it comes from a fear of litigation and a lack of leadership at the top. The final hilarious story is the CEO negotiating a big deal with lawyers and VPs shaking hands... and then saying without joking, "but I'll have to get HR's approval". The meeting wasn't important enough for HR to show up, but they had the last say.