Installing any app I want outside the Play Store was the primary reason I decided to go with Android, despite most of the people I know using iPhones. If I can't do this anymore, I may as well switch and be able to use iMessage and FaceTime with them.
You can still install apps outside the play store, but the developer does need to verify their signing information. Effectively this means that any app you install must have a paper trail to the originating developer, even if its not on the app store. On one hand, I can see the need for this to track down virus creators, but on the other, it provides Google transparency and control over side loaded app. It IS a conce…
Googles/Apples argument would have been much stronger if their stores managed to not allow scams/malware/bad apps to their store but this is not the case. They want to have the full control without having the full responsibility. It's just powergrab.