It’s also a different epoch. 1990 was all the rage about C. But now that a ReactJS dev can get paid 6 figures and move jobs easily in every big city, it’s much harder to find people who are passionate to build APFS or desktop apps for one vendor based in Cupertino.

I would be surprised if there was much overlap between those type of programmers.

The ReactJS type is doing fancy thin gs on screens and does it for the money and for all sorts of places. The APFS builders are more likely to be passionate and look for specific work. But 30 years ago the ReactJS types would be working for corporations using VB but the system programmers would be doing similar to now.

System programmers have always been rare and I suspectr less motivated by money more by having interesting work that affects many people.