That's true, although for another example, React is also commonly used with JSX to express DOM fragments. And JS has that syntax but Python, C, Rust, etc. don'

That's true, although for another example, React is also commonly used with JSX to express DOM fragments. And JS has that syntax but Python, C, Rust, etc. don't. In other words, the particulars of the language matters. I wouldn't underestimate 20+ years of JS evolution toward expressing the problem better. I'm working on my own language and all those details are hard. When they work, they're invisible to users. You only notice when it's not there or doesn't work! I would agree that Python is a better language than JS in most respects, but it's not clear to me that it's a better language for writing web front ends. e.g. the async abstractions and promises are different and I believe that matters.