Pretty much every company I’ve been in or know of values a vertical trajectory instead of a horizontal one for its employees i.e becoming a manager nearly always means a faster salary progression than becoming an expert in one or multiple fields.
Why is expertise valued less?
Agreed, those arent high level manager decisions, but they aren’t intern decisions either. They’ll be made by a mid level manager or team lead.
The higher up the chain, the less technical and more general the decisions get, but they do still need to have some level of technical understanding, or the direction they point you in could be completely detached from reality.