By killing the affordable Nexus line purely for the reason of luring in people who want a phone because of the price tag rather than features, releasing a £400 phone for £600 while it does nothing to justify that cost, and blatantly ripping off the styling of the iPhone. I don't wish them to do badly with the Pixel, it just seems that I am no longer the person they are trying to sell the phone to. I decided that if I wanted a £600 phone that looks like an iPhone, I might as well go the full way and get the real deal (and all the engineering and design that goes with it).
Not releasing any of the fancy Pixel software (Assistant, launcher, even Nougat 7.1 this year) on the Nexus 6P was what I mean by abandoning, I can understand that those are the only selling points of the new phone and the need to keep that exclusive, but again people with 6Ps were likely not the target market for the Pixels anyway so what harm would it really do. Obviously the good people at XDA have already hacked the majority of the stuff on to the 6P before the Pixel has even been released, but that shouldn't be necessary. The phone is 1 year old and is no longer getting the traditional Google Updates for the Nexus phones (IE first). It makes me lose a bit of trust, who's to say that they won't bring out the Google xxxxx phone next year and no longer give the 1 year old Pixel phones any of the goodies?
The Allo release also had started the ball rolling for me, everyone was screaming at them to make it like iMessage only with all the assistant stuff and make it something everyone on Android could use, but instead they made it just another IM client that not a single person I know uses, even the other guys in my work who are keen on this kind of stuff.
I haven't rooted or used Custom ROMs on my Nexus 6p at all, and that's after doing all that stuff on my Nexus 4 & 5s too, I can't be bothered any more and I just wanted a phone that worked, stock Android & IOS are very close to perfect in different ways in my opinion. If the Pixel was £150 cheaper I would have bought it probably without even looking at the iPhone 7, but at the same money there's no competition. Throw in Apple Care & an Apple store 10 minutes away and it was a no brainer.