Only for certain things. A lot of web browsing is still pure information-consumption. The "native apps" are also turning into effective webapps, thanks to Electron and the like.
Even this site, which is interactive, doesn't require JS to use (it provides some enhancements, but the site is still quite usable without.)
[0]: https://www.reddit.com/r/programming/comments/ar1qj1/_/egl52...
You can watch IO talks from Android, Chrome, Flutter where the presenter eventually throws some jabs at other competing stacks as if they aren't from the same employer.
Where I work, departments bill each other. Sometimes, two departments develop competing tools that are third department could make use of. Instead the third department use an off the shelf tool because the "license" for the internal tools is too expensive.
At these scales, companies are almost like states. A group of entities with shared services but otherwise working independently.
No it isn't. Competition with native apps is the completely wrong way to think of it. The web should complement native apps.