Still pisses me off, this was one of the reasons I updated and they half-assed the implemenation then said they're killing it because no one is using it... no shit no one is using it, you hid it it behind the Amazon App (that no one uses) in the MS Store (that no one uses) and layers of docs for sideloading.
It's been around in one form or another since the Windows Phone 10 days, it was a weird beta that would sometimes work and required a lot of faffing about.
In the end you are still at the mercy of their shareholders and their core mission of EEE over end-user empowerment. Every thing they build is designed with lock-in and obfuscation to protect themselves.