> Every time I see this kind of pet project I see whether they are addressing any actual issue of React

Then I think you're looking at those projects from the wrong angle. The point the author is making is that React is often used in situations where VDOM or complex state management aren't actually necessary. If all you're doing is e.g. validating a few form fields then neither is needed. But people use it anyway because React has become the default for frontend engineering no matter what.