[rpbiwer2]

One major caveat is that PWAs don't have all the capabilities of a native app. I think that's the biggest issue people have with this -- if PWAs had full feature parity with native apps, I'd agree Apple's app store monopoly wouldn't be a big deal.

I think there are many reasons why something that people do want might not (yet) exist. For example, a monopolized market where customers don't have many choices. Or like you mentioned, difficulty in competing with incumbent advantage. Or maybe people just don't know what they want (e.g. "faster horses")