You could argue that iOS 13 wasn't ready for primetime on its release. Things have stabilized now, and it appears Apple is wanting to make some changes in how they test going forward. What can we learn from this for our own development? I think the best takeaway is not to cram too much into each release. Add a feature or two, fix some bugs, release, and go from there.
testers would go days without a livable build, so they wouldn’t really have a handle on what’s working and not working
Inside Apple’s iPhone Software Shakeup After Buggy iOS 13 Debut by Mark Gurman
Apple has released a new developer app. What was formally the WWDC app is now called the Apple Developer app. You can keep up to date with the latest dev news, see WWDC resources, and even enroll in the dev program directly from the app.
Introducing the Apple Developer App from Apple