There are plenty of Python libraries that are similar complexity to React, and not just for web development. Huge frameworks aren’t unique to JS, but depending on your background you can totally “learn” how to use them in two days, at least at a base level while you google how to do everything else (but let’s be honest, we’re doing that ten years in too lol).
But my point was more that gatekeeping “learning” a new tool isn’t really a conversation you can win, because when do you actually consider it “learned”?