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Pixel 6, 7 series get an extra two years of software upgrades
(mobilesyrup.com)
This is a most excellent place for technology news and articles.
Makes sense. I suspect they're selling more of those overall so they like replacing them more often. The only reason they're providing longer support for the S-series is because someone else does too. They have made their own SoC (Exynos) for more than a decade and there wasn't anyone stopping them supporting the models with that SoC for longer. They didn't.