I find this GDC talk more concise and comprehensive, on the same topic:
So They Made You a Lead, Now What?
So They Made You a Lead, Now What?
It has a scarring effect ive found, anecdotally. Ive spent 12 years as a systems administrator in various contexts (traditional, devops, contract, etc..) and I've already declined a leadership role on the pretext that its just going to be system administration with the expectation with added clerical ditch-digging for the real management team.
I don't see any difference between not getting any leadership training and not getting technical training throughout your career.
When I want to learn a new technology, I don't wait for the company to train me. I train myself. When I got thrust into leadership (see a previous comment to this story), I started training myself.