There are still a lot of fields where performance matters. This is especially true with apps that need low latency, like most games. Something like Stadia may be fine for a casual gamer but it still feels laggy to many, especially those used to gaming at 144Hz+ with almost zero input lag and gsync.

VR is another area where native desktop is still superior.

Then there is anything that is dealing with a lot of local data and device drivers. Video editing for example.

Development tools that work in a browser are getting better but native (or even just Java-based like IntelliJ stuff) still seems superior for now.

Stuff that doesn't use TCP, like network analysis tools, either need to be done as a desktop app or need to run a local server to point the webapp used to control them to.

I guess what I'm getting at is that if you need low-level access to the local device or if you care a lot about things like rendering performance then native is still the way to go.