What keeps me and a lot of people/companies on React is React Native (and React Native web / strict dom). I'm sure we could move over to Svelt or Vue or any other number of frameworks on the web, however having a shared codebase and/or shared components across native and web is a game changer and not currently possible with anything but React.

100% agree.

Our react/react-native monorepo has been a pleasure to work with and has massively reduced the overhead for development with a limited number of staff.