This isn’t everyone but it’s partially the Peter principal… Basically people get promoted till they are incompetent.

Let’s say you run a manufacturing plant. You have a team of 10 people but 1 is far better. They are quicker and cause less mistakes so you decide to promote them to team lead.

They are a good team lead. They share knowledge and help out in between so you promote them supervisor.

They are a decent supervisor, monitoring the workers, good communication etc. You promote them to manager.

They suck as a manager. Can’t keep track of inventory, quality is slipping, quantity produced per day is dropping. You can’t really demote them that’s not really a thing in most companies. You can either stick with a crappy manager or fire them. Either way you lost your best operator. To make it worse they have “manager” on their resume now so a lot more likely to get another manager position at a different company where they will also suck.