I completely disagree that the speed isn't good enough to justify using them.

In fact, my bounce rate is high on AMP because I can near-instantly figure out if this particular article on this topic I searched is the one I actually want to read or if it's uninformative trash. I usually flip through 2-5 before settling on the one I think is good.

These are the same sorts of complaints people have made about every change to search ranking. And while, yeah, I'm sure Google's not being altruistic, the implications of most of their actions in these spaces is pretty consistent:

If you want people's attention, don't ship trash.