Semmelstulle

And you’re forced to create an account to use it. At least it did a few months back

Yes

For me it’s the Apple Watch because I can write apps for it

Pros:

• quick
• Auto Updates when reloaded
• offline cache
• everywhere the same layout

Cons:

• usually isolated windows, eg. with Safari none of your extensions will be applied
• missing OS features like widgets that full blown apps can use
• if you’re on a website there is no “open in PWA”, just open in apps or using the browser separately

I don’t know anything about making PWAs integrating with other apps though.