It seems to me that React + JSX are perfect for "divitists" and devs who use a h3 because its font-size has the desired value.
I'm not being sarcastic, I genuinely can't understand why a good web developer who cares about the meaning of a HTML document should like JSX.
Especially when you have a news site getting millions of views, you simply can't afford 1 second on page load to download, parse, and eval React and your data model for little gain.
I've seen devs that are so infatuated with React and "isomorphism" that they will use it as a hammer for every screw they come across.
I've found that React generates trustworthy HTML, letting me focus on business logic and the interesting parts of development. I've never come across a scenario where React threatened the coherency of my code (other than the data attributes that are now optional, thankfully).
A good html developer will still use best practices when using React, a bad one won't. What's the difference?
That's why this question began to slowly form in my mind.
[edit: phrasing and grammar]