While the Pixel 6 ushered in three years of major Android OS version updates and an additional two for security patches, that’s still nowhere near the longevity of the iPhone. Google hopes to change that on the Pixel 8 and 8 Pro with noticeably more OS updates.
I’m not sure about specifically stopping at 80%, but mine has a feature that slows charging down at the end of a cycle so that it won’t overcharge