React expects to own the DOM and that state is managed by pure functions. There are good reasons for this, but the consequences are that it's restricting how the web platform works and when something does not agree with it weird things can happen.
Is it bad? Sometimes. Is it the rest of the Web fault? I don't believe so.
If you are using React you are largely constraining yourself to work in the React model, not in the Web model. That might be fine, but it might also not be.