This is one of the integral features that prevented a lot of places from even creating PWAs. Now that it no longer exists as a problem, PWA adoption will increase and alongside it education. For example, many places are probably going to show a "add to home screen" banner, with related icons to make it easy for people to find where that setting is. Kind of like how many "normal users" in the past would have been scared about downloading a new browser, but now when you download a new browser it shows you the next steps on how to do so (most of us don't even think about these anymore, but they exist and are important).

A next major step is inclusion into the app store, but until then this is a major win for PWA.