I used the 6P for a fair amount of time, but I think the Nexus 5 was still the high water mark for Nexus phones. Cheap, great hardware, durable, and perfectly sized.
That said, I would have kept my 6P if I had known how disappointing the Pixel 1 was going to be. Double the price without any useful changes just feels like a rip off. No chance I'm going to throw more money at Google for another mediocre product.
Google just dropped support for the Nexus 5X and 6P, for unknown reasons. I hate it. Now I have no options left. (I need a device that will get android developer previews)
Some of my users are on Pixel devices and will get Android 9.0 the day it is released, while in best case, the source code only drops a week later. So assuming it takes me 10 minutes to fix all bugs, my app might crash for a week.
Realistically, my apps would be at least a month unusable.
That said, I would have kept my 6P if I had known how disappointing the Pixel 1 was going to be. Double the price without any useful changes just feels like a rip off. No chance I'm going to throw more money at Google for another mediocre product.