"on mobile" these days can be anything from a 3'' device with 512MB RAM to the device you mention.
It's very easy to assume that everyone has the latest device in an affluent society that doesn't have much of a problem buying the latest and greatest, but I can assure you this isn't the case in most of the world.
You're failing to see that Google is used everywhere in the world and not all countries (in fact, very few) have markets where the standard device is what you describe or where everyone has blazing fast LTE available everywhere.
For example, there are places here in Colombia where 2G is the norm, that's the kind of people AMP is helping, not the bay area kid that has the latest iPhone and 100Mb Wi-Fi
It's very easy to assume that everyone has the latest device in an affluent society that doesn't have much of a problem buying the latest and greatest, but I can assure you this isn't the case in most of the world.
You're failing to see that Google is used everywhere in the world and not all countries (in fact, very few) have markets where the standard device is what you describe or where everyone has blazing fast LTE available everywhere.
For example, there are places here in Colombia where 2G is the norm, that's the kind of people AMP is helping, not the bay area kid that has the latest iPhone and 100Mb Wi-Fi