Great news.
Apple has turned the magic of software development from “how cool would this be?” to “how cool would Apple be with this?”
That’s an environment of software suppression instead of free innovation, and Apple has felt little pressure to change.
For anyone concerned about the security and privacy implications, don’t fall for the misconceptions perpetuated by Apple: non-App Store apps will still be sandboxed (so they can’t access other app or system data), and also scanned for malware by Apple - just like App Store apps!