As someone who uses a SPA (React) for webapps - I find it very useful. I run into issues that wouldn't happen if building purely html/css/vanilla js and when that happens I fix the issue.

The biggest benefit of using a framework IMO is that you're given a fairly strict structure to work within, which makes organization a lot easier. For someone who isn't a master, having some rules "baked in", helps a lot.

That being said, I wouldn't use React to build a static page/site, that makes no sense.