Coming from the android world there is a very high bar for a native app for me. I tend to assume the app is garbage if it could have been done just as easily as a web app.
The difference between a native iOS app and a fake app that's really just a wrapped web page is obvious. Native apps are a lot faster. It's possible there is some selection bias here and you only notice the web apps when they're bad, but I really don't think this is the case. Native apps just seem categorically better.
If Facebook pouring immense resources into it couldn't get web based mobile applications to be good, it's probably because the technology just can't compete with native.
They are also the biggest abuser of UA agent while chromium team is trying to get rid of it. There are so many things they get wrong that they preach or push themselves.
Also, there are technical limitations especially around tracking lol. Web apps can't run processes in the background or access your files without your consent everytime.