I get the impression it's mostly physics guys.
Relevant xkcd: https://xkcd.com/435/
TLDR: Math is not. :-)
I almost went to get a CE degree because I find it all so fascinating but ultimately I'm glad I didn't.
the serious system architects, designers, and fab managers are doing just fine, software or not. the dudes in Phoenix who are getting pushed through 2-year degrees to help run a clean room are probably making 65k.
This is the crazy thing. Such fundamental important technology but salaries generally suck. Much more money in cat memes and influencer channels.
In fact for a small project in an elective he programmed a computer vision system that was far ahead of anything me or my peers had made at the time in our CS program. He had pretty much zero programming experience.
I must admit he's a particularly smart person but it was crazy that I went on to make more money than him. His work is way more complicated than mine as far as I can tell.
TSMC is so dominant because they have very, very, deep institutional knowledge. Even if you have billions to invest it's not easy to create that, and definitely impossible to do it short term.
There's only 3 companies left chasing smaller nodes. Everyone else has given up and are focusing on revenue from high volume parts in older processes.