Permabanned
I think your Titan-craziness has shifted your sights somewhat. I'd definitely say a 1080 is a high-end GFX card - especially as it was the flagship when the range launched. 1060 & 1070 are mid-range, IMHO.
No, they weren't the high-end parts... they just released the mid-range parts months ahead of the high-end parts like they have since the 6xx series.
Just because the new generation mid-range is a bit faster than the previous generation top-range doesn't make them top range, it just makes them well-performing mid parts.
Before then they would release the high-end part first and then trickle out the others.
It's a result of Nvidia having no real competition any more... they're doing it to milk their consumers.