So that explains why they dropped android support.
At my workplace we use TestFlight integrated with Jenkins. We commit to the repo, Jenkins builds the APK, and submits to TestFlight. Then our QA team can pull the latest build onto their device and test, and we get crash reports if things go south. That tight loop is not as easy with the Play beta testing.
Bummer about Android Support. But on the flip side, installing apks outside of PlayStore is actually very easy on Android. Compared to the provisioning-profile stuff involved with iOS.
I guess I'm about to write a small in-house nightly web-server that just has APK urls for download & install.