You'd be right if, 30 years ago, people were required to download proprietary software and run that on a locked-down computer (you don't get to have administrator-level access to it) in order to do simple things like pay a parking meter
Internet is (increasingly: was) an open system that you can connect to on your own terms. Browsers do your bidding, for the most part anyway and you can switch if you don't like one of them. However, you can't simply install an open source version of Google Play Services on your phone and if the Deutsche Bahn app doesn't work for you, there is no alternative that you can install to talk to their server and buy that train ticket (no equivalent to installing a different browser aka 'user agent')
Internet is (increasingly: was) an open system that you can connect to on your own terms. Browsers do your bidding, for the most part anyway and you can switch if you don't like one of them. However, you can't simply install an open source version of Google Play Services on your phone and if the Deutsche Bahn app doesn't work for you, there is no alternative that you can install to talk to their server and buy that train ticket (no equivalent to installing a different browser aka 'user agent')