[makeitdouble]

Let's take the Pixel 1 then.

You can still update the play services [0] or straight root it and install another OS

[0]: http://google-play-services.apk.watch/23.06.17%20(040400-511...

[yftsui]

Pixel 1 was released in 2016, you have to root to upgrade OS, but not able to upgrade Android major versions.