Push notifications and home-screen icons are strictly opt-in. If you don't want them, don't opt, simple as. I use webapps for several things because I can much better protect myself from tracking and data-harvesting with a well-configured browser than I can using a native app.
There's a preference to disable this, though. Don't get me wrong - it's awful and I hate it. But I'm sure there are valid use-cases for people who use e.g. webmail.
It's a feature some people like and use. I like getting notifications from some services I use without needing to keep a browser window open on that page to get notified. And I like not having to download and install yet another flipping app to get that feature.
I cant imagine a service that you frequent enough to want push notifications but not enough that you would be willing to install a native app for a smoother experience.
Installing an app is not a smoother experience. Allowing notifications is one click. Also, apps don't always have the same features as websites. You also make the assumption that services I use with browser notifications also have apps. This is not true in the slightest. And in some cases, I still prefer the website over an app.
How is it hard to imagine a service I don't frequent use but when I do, I want notifications? I use these services a few times a year at most. Why would I want to install an app if they have it?
> I cant imagine a service that you frequent enough to want push notifications but not enough that you would be willing to install a native app for a smoother experience.