Funnily enough I spent a year or two in rural Australia on satellite Internet and I definitely see your point. I think it's okay for a site to offer an AMP capable site, I just don't think it should factor into the ranking. Perhaps there could be a Prefer AMP pages flag? Or the inverse, ignore Page Speed. I will concede that the majority of users probably get by with page speed as a factor and that my concerns are not those of the general user base.

As an aside, gaming on satellite internet was a real drag, the only game I had that would handle the full seconds of latency was Star Wars Galaxies. Thankfully that was already a favorite.