I hate to do this right after I asked the question to answer "what", but I do have to point out the obvious fact here. Everything, and I mean, everything that Google presented today is available on Android in general as long as your device is officially Google Certified. No feature that Google puts out stays exclusive to Google Pixel devices. So I ask again, what in particular amazes anyone to justify paying the premium for Google?
I hope you know I'm drawing a comparison here to the famed "Apple Tax" that everyone for eons has been complaining about. Google just matched and in some ways exceeded the "Apple Tax" by proportionally making their devices more expensive than even Apple while proportionally offering less. It's a pure profit play. Google thinks that in the sea of Android devices they can be the premier player, but I am not sure that this will materialize.
The sales for Pixel 2/XL are likely to be lower than the original Pixel as Android buyers, save Samsung, are generally budget buyers (not everyone, but large majority). Even Samsung buyers are "budget" compared to Apple, simply because Samsung generally offers additional perks to get customers to buy into their premium devices, and very aggressively offers incentives to attract buyers, none of which Apple does. Based on their recent moves, Google wants to be exactly like Apple, all premium, no incentives, and wants to be able to charge a "Google Tax" - an unnecessary premium not tied to any particular benefit for the consumer (FWIW, at least Apple has unreal customer service).
Finally, to provide a bit of input on the last, partly rhetorical question that you asked, there are no "tax free" phones. Every company plays for profit. However, there are reasonable margins and there is outright gouging. What Apple, Samsung, and Google are doing with their new products is basically price gouging. I don't think it will work for Apple, Samsung, or Google. A couple of decent, true high-end entrants from China into the NA market and you will see how fast sales can slump.