React is a mature project with a huuuge ecosystem of libraries and components. It is wery well tested. While not being particularly great at anything, its not worst at anything, either. I dont expect a competent dev to ever encounter performance issues with it.

Other frameworks have their own problems. Solid requires a custom babel compiler plugin. Some are new and lack components, placing a huge backlog to reimplement everything from scratch, just not worth it.

We need a framework that will not tie components and libs to itself, so they can be used with other frameworks or with plain ts as well.