How are Android web apps going? An argument based on a hypothetical is inherently weak.
They might not choose to limit functionality as much but Android does not have first-class support for web apps either.
Windows uses executables and msi's as programs and users know that these programs are first-class citizens. Almost nbody on mobile knows about apk's and ipa's. These systems were designed to inherently educate the user that software can only be installed via one place.