[SpicyLemonZest]

Marxist class analysis was developed for situations where that wasn't the case. The clearest example in the US would be trucking (and it's not a coincidence that trucking has one of the highest unionization rates): the people directing where trucks should go have often never driven one themselves, and the people driving the trucks rarely expect that if they drive well for a few years they'll be promoted out of a driving position.

My understanding is that outside the US this dynamic is more common in a variety of industries.

[ElevenLathe]

Yeah I mean Marx himself lived in a world where the aristocracy was still a going concern. Still, management is fundamentally aligned with ownership. If anything, the dynamic you're citing (line workers being promoted into the lower rungs of management) means that line workers themselves have incentive to align themselves with ownership (as a way of auditioning for the job of doing that for money, as management). It definitely doesn't make the managers less aligned with ownership. There are good reasons management can't join a union.

Again, this is basic political education everywhere else in the world. This is what other countries' schoolchildren are learning while ours are learning why it was actually good and necessary to nuke Japan, how "manifest destiny" is also ultimately good and moral, and how the Civil War was mainly about something abstract called "states' rights".