Well, I interpreted the point of the discussion as why would devs chose webapps when that doesn’t provide the most reach.
I think your point about users not knowing how to deal with web apps applies equally to not knowing how to deal with alternative stores - and in ios is not possible at all.
However, a web app can still be used as a regular website in the browser, even if the user can’t figure out how to add it to the Home Screen.
I do agree with the rest you said. Webapps do provide a worse experience on mobile.