Of course! The PWA is self-hostable, hackable, and receives updates quicker. However, it doesn't have access to certain native APIs that the native app takes advantage of.
Can I continue to use the Test Flight beta?
Yes, but I recommend switching to the App Store release if you aren't actively involved in testing. It's a more stable release :)
Looks good to me. What I still miss from Apollo is a swipe right to get βbackβ to a post I just swiped left from. Something like the browser forward button.