You just summed up "the largest, most active open source community that has ever existed" with "they" and suggested that "they" are all thinking the same thing with one mind.
With some of the comments around here being a demonstration of this very phenomenon. But then, “what I cannot build, I do not understand”. The kids may be rewriting the universe in JS, but hopefully they will learn something from it, too. When we did it, in the bad old days, it was Basic and Assembler. Those environments were about as shitty and unstable as JS is today, but otoh that may foster an appreciation for proper tools once you get your hands on them. It worked like that for me. And, besides, arrogance is the privilege of youth. It would be very strange indeed if we didn't encounter it in this space.