I'm gonna play devils advocate here and say web apps aren't as pleasant to use on mobile phones as mobile apps and that's why mobile apps are still a thing.

I'm especially looking at things like touch gestures and native integrations (launcher icons, notifications, "share with" providers, maybe even a home screen widget). I know PWAs are a thing but afaik they don't solve all of the above problems or don't solve them well (for example there are still inconsistencies as to what is a PWA and how PWAs are handled across Firefox and Chrome).