https://www.thurrott.com/windows/windows-10/135665/pwas-comi...
But also, consider that people don't seem to really download that many apps. Less than one a month. So I agree with you, in that users may be conditioned to expect a certain workflow, but it's not like it's a deeply ingrained habit that people are doing daily. Also, when you visit a site multiple times, the browser shows a pop-up offering to add the app to your homescreen. So it's low-friction onboarding.
https://techcrunch.com/2017/08/25/majority-of-u-s-consumers-...
Disclaimer: I work on Google Web DevRel