The pixel 3 doesn't stop working after support for it runs out. Same as how that 4th gen iPad hasn't received the last 5 major version releases. (It runs iOS 10, we're on 15 now)
The last iOS 10 update is 10.3.4, shipped in July 2019, a bit more than 6.5 years after the release of the 4th gen iPad in Nov 2012.