And yet somehow web apps, each with their very own shirty UI and UX, that looks and works completely different than the platform you use them from, are doing just fine.
And the vast majority of webapps are shitty UI/UX from a consumer perspective. Doing just fine with shitty UI/EX, because the platform is crippled does not equal the best solution for the user.
Web is convenient in the sense that its easy to get access to a lot of applications and you don't have to install them etc, but the UX often leaves a lot to be desired...