I think part of it is also level of effort.

You could right click "inspect element" in any browser and mess around in the html or the JS console and see things happening live. This is an extremely low barrier to entry.

Low barriers to entry are good, our profession is very well compensated and developed economies could certainly use low effort ways to get people from lower compensated jobs into higher compensated jobs* but that also means that there are a lot of cooks in the kitchen.

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* yes, tech isn't for everyone (what job is?), and when I say low barrier to entry I mean you don't really need to subject yourself to what could easily be 5-10 years of schooling in medicine or law or engineering.

the level of effort is determined by how deep in the stack you are. if you make a new JS framework every single browser will run it, if you make a new web scripting language good luck getting support from even one browser

Yeah but to be good, you have to have like at least 5 years of experience shipping stuff. It's kind of like going through many years of law/medicine school.

Not all the ways to do that come with either the punishing schedules (e.g. residency) or the massive loan debts.