Google discusses Android O and Android Go at I/O 2017

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Meanwhile it celebrates that 2 billion monthly Android devices are active.

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Be nice if Go is offered to, say, the Nexus 5 and similar devices. If so then I would actually take the risk of replacing the battery on my wife's phone (as it's a bit lame now) and sticking Go on it so it stays more up to date.

if they are redesigning apps to be "using less memory, storage space, and/or mobile data" then why can't they do this for the core app experience?