Why is JSX considered bad, really?

I don't know what people really think. I would say myself that it slyly encourages complexity, but it's just like a gut reaction from me and not an elaborate argument. Searching the internet falls rather short actually with the question being asked most frequently something like 10 years ago now (when React first arrived on the scene). I don't think there is a blog post from Rich about it either. Solid and Qwik both embrace JSX. So why is JSX considered bad, really?