I think we mostly agree. I was arguing against people only being teachers, and being paid to be teachers, as opposed to being given the resources to exist and thrive no matter what. In universities, people are often researchers and teachers, or accountants and teachers, or lawyers and teachers. This is one way you could do that. Socializing people into social roles through other institutions like apprenticeship, or in the family (as rich people and many tradesmen already do) is another.

So my objection isn't to "being locked into a discrete career path from an early age," but simply being locked into a career path. I believe that would have downstream effects such as the dissolution of boundaries between roles like teacher, parent, tradesman, or scientist