No disagreement on blast radius and the point on training new managers, instead what I find less logical is when a 50+ person organization has 25-30% of people as manager roles, meaning this isn’t an exceptional or temporary situation (i.e. training one or a small number of new managers), it’s actually a core part of organizational design.
It’s done like this bc leadership at those companies want to have certain number of directors reporting to them (for resume padding purposes). The directors then need sr manager reports who in turn need multiple manager reports, etc. Pretty sure it has nothing to do with concern for low level employees’ careers as up and coming managers