The JS ecosystem skews younger, not in age, but in years programming. Most people who maybe want to dabble, or fix a script or something, start with JS or Py, and as most of us do, they enjoy programming and venture out to pick up another language along side it. As is the custom, eventually if they chafe against the limitations of JS enough, they move on to something that improves on those, and their newer contributions go there, whether it be typescript, rust, zig, go, and so on.

Looking back at the JS side where the types don't bite, there's a library for everything, and the logos are really good, what we end up with are a lot of first year, or first three year contributions to the ecosystem, so a lot of patterns and algorithms are wisdom lost and aren't present, a lot of libraries are good but not perfect, and there is really no incentive to really dive in and become an expert on a given framework like react, because any day the community might decide, "It's VUE time now" or some such other technology, and suddenly you're the guy using Gulp and Angular on a busted 2021 macbook at the hackathon and people are addressing you as "sir"

There is no incentive to be "the react guy" when it comes to JS ecosystem, that 15 mins is quick.