Starting in August, installing APKs from unverified developers will require a new procedure called Advanced Flow. It involves enabling developer mode, rebooting the device, and waiting 24 hours with biometric verification.
After that, you choose: allow the APK installation for 7 days or indefinitely. The procedure is a one-time process and applies to all versions of Android.
Will the 24-hour wait stop you from installing APKs outside the store?
I have to admit I’m in the same boat, ive been on android for 15 years, but if they take away Graphene Im just switching to iPhone, at least then I won’t get complaints from friends and family about lack of Imessage.