The critical flaw in your rather nice list, is the fact that everything you've listed for android only applies to a phone from google. And it has to be unlocked. If you're a sucker and got a verizon Pixel, you're still stuck behind their validation testing.
That is not true. People on /r/googlepixel with Verizon pixels are already reporting that they're getting the OTA update. I'm on T-Mobile with a non-VZW Pixel 2XL. OTA updates for Pixels with T-Mobile SIMs are held back until T-Mobile validates things like VoLTE and WiFi Calling work, and are usually available after a week or two after initial release. But you can sideload the update manually, which I did last night on my 2XL. I took a gamble that VoLTE and WiFi Calling would still work (I didn't really care if they don't), and it seems that they still do, even though T-Mobile hasn't validated it yet. Also, AFAIK, even the Verizon Pixels, with the locked bootloader, can still have the update sideloaded before it's available OTA. Basically, anyone with a Pixel, regardless of who or where they bought it from, can be running Pie right now if they wanted to.