Enrollment at trade schools is expected to grow

I've been trying to convince my brother-in-law (who works at a convenience store) to consider trade school for years now, in no small part because I think a lot of the jobs you go to trade school for are safe from automation.

For reasons kind of unclear to me, it seems like trade schools have been kind of stigmatized, as somehow "lesser" than university. I don't completely understand why that is; the world needs welders and AC technicians and Practical Nurses much more than we need more software engineers working at a Silicon Valley startup.