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This is somewhat moot as (a) I think most React devs don't do this, and (b) if they do, the resulting page may still not be very useful.

However, any React developer worth their salt (probably still a minority, as mentioned above) should be using ReactDOMServer which will render the page fine without browser JS being enabled.

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I thought this was mainly used to improve first load speed. The site won't be very useful if you can't interact with it beyond that.

While it does depend on the purpose of your site, even in the purest examples in the "web app" category, I can think of very few sites that are guaranteed to be absolutely 100% useless without interactivity. Certainly not as useless as a white screen.

In most cases though, you should be able to present a pretty useful static page by default without too much effort.

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