Even having a shortcut on the desktop would be a reson.

Electron and similar technologies (not sure about this one) have APIs to integrate into the OS, and have access to notifications, filesystem, and lots of other components that are normalltly reserved yo native apps.

This allows devs to build a web app and port it to every platform without much effort (if any).

I was able to use a modern version of Skype this way, instead of the crappy native client that they haven't updated in years.