And I have been saying this for well over a decade. Hopefully it catches on.
I have always asked for example of sites done in React where I couldn't tell it is done in React or other JS Front End. The "at worst, hundreds of milliseconds" is precisely why Web Apps never felt as good as native apps. And if we collectively cant make web apps good, why not go back to Interactive Web Pages that is mostly Jank Free. I say mostly because it is still not Native Apps level.
Recently submitted, [1] why does liking a tweet re-render the entire screen? done using [2] React-scan.