My guess is that since frontend web development is at the top of the stack it has an incredible amount of freedom so everything changes every minute. You don't see too many people wanting to subvert HTTP making a billion homemade alternatives
No? I constantly come across new protocols, promising improvements compared to it. Some even become relatively popular and are included in browsers by default. Just some examples are WebSockets, WebRTC and QUIC. I expect we'll see more of them in the future as specific use cases requires more specific protocols.
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.