[izacus]

I think Google wants to allow OEMs to build devices that only support arm64-v8a arch - this will make the OS image significantly smaller because now they need to ship several components in duplicate - 32 and 64-bit versions. This is beneficial to total size of OS on the flash.

Apple did this years ago.

[kalleboo]

RAM usage as well as you no longer need to keep both 32-bit and 64-bit versions of OS libraries in memory at the same time.