I have been in 4 different companies, with a decent to very good salary. React is self-fulfilling prophecy also because developers want to make as much money as possible and companies need more React developers because, at least in my experience, development is so much harder and slower with react - so companies need more react developers, and because there aren't many in the market, price (salary) per developer goes even higher.
So everybody learns React, because companies need more React developers, because development is too slow. Think about it, which developer would prefer framework/library that gets job done quicker and easier, but pays less?
Your reasoning may be backward: Companies with poor codebases have middling developers, and middling developers choose the most common languages.
It's the same with Java versus Clojure. Are LISP macros really the reason those Clojure devs seem so productive compared to Java bodyshops? Or is it the most talented devs going after exotic technology, and the less able going for the lowest common denominator?
Don't know anything about your company or product, but I've been in 4 different companies where React was used. Every single one had different setup, best practices, state management lib, "the way" of doing things, bundler (create-react-app, next.js), etc.
Each project was so big, that I'm little in doubt about your statement "within 24h they contribute to the code". It could be your react apps are very very small or junior devs are very very good and probably shouldn't be called juniors.
There are 102 countries having fertility rate above 2.1, a lot of these countries are in Africa or Near East. Still in a lot of these countries, fertility rate is dropping year by year
