Android 8.0 Streaming Updates won't take over phones
Android OS updates can take ages. The last time I updated my (admittedly now vintage) Motorola Droid Turbo, the phone was unusable for nearly 45 minutes while it slowly shuffled around system files. For that and other reasons, Google created a feature in Android 7.0 called Seamless Updates. Soon, with Android 8.0, Google will be updating that feature to "Streaming Updates". Not only will it eliminate update downtime (as Seamless Updates can already do), it will also discard the user-area free space requirement.
Seamless Updates split the on-disk system partition into two separate spaces: one "online" space for the currently-running system, and one "offline" space for pending updates. The idea is that the phone could update critical system files while the machine is running without having to unmount them, allowing the user to continue working (or more likely, ...