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It's not just Microsoft's fault.

Intel have completely removed S3 sleep from the latest Tigerlake chips so even if you run Linux you end up with the same problem.

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Lenovo is able to add it back as an option in the BIOS. This is the case for P14s Gen 2 and X1 Carbon Gen 9.

S3 is an ACPI concept, not a hardware one.

https://www.reddit.com/r/System76/comments/k7xrtz/comment/ge...

This sounds like they aren't working on their own ACPI implementation, and are at the mercy of whoever is providing it (motherboard or bios vendor? intel?). Hence conflating hw and firmware and not using precise terminology. Elsewhere in comments here it's claimed that eg Lenovo implemented S3 on these CPUs.

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