Hi so sorry to reply so lately,
Here are some answers to your questions.
1. There probably are very few devices that support 16KB page size. So using CameraX 1.3.4 will work on almost all existing devices. Google Play could possibly request apps to support 16KB page size next year.
2. No CameraX 1.3.5 plan as our release branch is now CameraX 1.4.0 , there is no way we can release 1.3.x again.
3. Regarding the newer D8/R8 issues, I am afraid you need to confirm it with D8/R8 engineers. I suggest you ask questions on the
bug 4. Good news ! CameraX 1.4.0 will be released on Oct 30th.