Right, in fact, when I was researching for this article, I thought that the fact that the restriction didn't apply when installing apps via the session-based in

Right, in fact, when I was researching for this article, I thought that the fact that the restriction didn't apply when installing apps via the session-based installation API was a loophole/because it wasn't fully implemented in DP2. I surmised that this loophole was intentional so as to not hamper third-party app stores from providing users with apps that use the AccessibilityService API, but I was only able to confirm my suspicion after contacting Google PR.