>and if it's so easy to become proficient then what prevents those "engineers who optimize compilers" to become proficient in JavaScript and compete in that mar

>and if it's so easy to become proficient then what prevents those "engineers who optimize compilers" to become proficient in JavaScript and compete in that market? Because money is not the only motivator for someone to work. And besides that, from a macro perspective the "free market" is simplistic propaganda. I don't know why people keep bringing it up. Nothing in the real world works that way. Real world is messy, arbitrary, impractical and irrational decisions are made every single day by all human beings. Normal human beings don't sit down and try to "optimize" some cost function in their life/work.