That's the real question: how many of them are used as smartphones?

The answer, I think, is "Not many".

So, these are technically smartphones, but they're being underutilized. Well, let's just call them underachieverphones then.

The Macalope completely buys this answer, but he's still confused about some of the implications.

For Google, it doesn't matter whether an Android powered device is used for smartphone-like tasks or simply for cracking nuts or playing music in a car.