> There just isn't a supply of good developers for companies that aren't FAANGs or unicorns.

> interviewing for a react/redux position one of the first questions I ask is [very vendor-specific technology question]

FAANGs don't hire people for "react/redux positions", they trust smart, conscientious people to learn it when needed. Maybe that's your problem.

Maybe the good people aren't already "react/redux programmers".