How long will the Samsung Galaxy S9 still be officially supported?
An article on SAMMOBILE talks about “Samsung will continue to provide security updates for another year. The Galaxy S9 and Galaxy S9+ are currently on a monthly cycle for security updates. They will eventually be downgraded to the quarterly cycle.”
My sources are talking about not expecting the once premium devices to get a major upgrade to Android 11 yet. The Android 10 update with OneUI 2.5 that was distributed last year once again brought powerful improvements on the firmware level as well. Thus, I was able to transport my Galaxy S9+ into the Android 11 spheres via GSI AOSP Android 11 without much effort.
My sources, who have very often been right with their predictions in the past, quote numbers in contrast to SamMobile: Android security patches are still expected monthly until the end of 2021 and quarterly thereafter until the end of 2022.
The fact that /e/ can build OS ROMs without lineage /e/ and also backport security patches from higher Android versions was proven by /e/ with the Samsung Galaxy S7 / S7 Edge under Android 7.1.2 Nougat. By the way, a few enthusiasts in the Lineage community continue to do so.
All in all, the signs are good for these two Galaxy’s - also because of their Treble GSI compatibility and because there are and always will be enthusiasts like the GSI genius phhusson aka Pierre-Hugues HUSSON, who build an absolutely Google free GSI code and make it available as open source.