As for the topic being discussed - Apple have gone out of their way for the last _decade_ to avoid implementing things like ServiceWorkers properly. I remember having this same conversation back in 2015. It is a real shame, as things like the proposed w3c sensors api would totally eliminate the pain of deploying private/internal/enterprise apps to a fleet of employees, for example. There is so much that this enables for private apps. I won't be surprised if their decade+ old viewport meta tag reference documentation for home screen icons and status bar styling in full screen mode stops working at some point too - it's been neglected for years. It'll be a weird, heartbreaking example of corporate revisionism, especially considering Steve Jobs' original vision for apps on the iphone.
I'm not a huge fan of the big G either, but I honestly hope they take advantage of this with some clever (non-developer) product-centric marketing. PWAs are a very well thought out approach to 90% of what modern apps are. We absolutely should be sandboxing private browser instances per PWA, not shipping entire separate webkit wrappers for every app every time an app is updated. It's almost literally the same difference as shipping layered container images as updates instead of giant VM blobs. Such a huge loss.