That’s never going to happen, and the reasons are twofold:
Brands want to push their own style on people, to make themselves recognizable, and to push their ideas about UX to their users (because they obviously know better than the OS/DE/compositor/whatever people).
It’s easier and cheaper to build a web app, because there are so many web developers. It also usually allows you to give an “app” to people who want that, while giving a (perhaps somewhat limited) browser version to everyone else, reaching the maximum amount of users while maintaining only a single codebase and keeping everything more or less cohesive and looking the same.