Skimming through, I am surprised they don't call out this. I know for a Pixel 3a, you cannot even boot AOSP without compiling in the driver binaries: https://s

Skimming through, I am surprised they don't call out this. I know for a Pixel 3a, you cannot even boot AOSP without compiling in the driver binaries: https://source.android.com/setup/build/downloading#downloading-proprietary-binaries https://source.android.com/setup/build/downloading#downloadi... https://developers.google.com/android/drivers https://developers.google.com/android/drivers And there is an entire vendor partition (On the Pixel 3a, it was >400 MB). However, even if a user built AOSP with those drivers, VoLTE, SMS on LTE, Wi-Fi Calling, eSIM, and a few other things (Sorry I don't remember) do not work. To get those features, one has to extract them from a stock image: https://wiki.lineageos.org/extracting_blobs_from_zips https://wiki.lineageos.org/extracting_blobs_from_zips I can't imagine this is any better for newer Pixel phones, nor for any non-pixel phones. This will be true for compiling AOSP or any Android ROM.