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Apparently, Windows 11' requirement of a relatively recent CPU is due to the need for TPM 2.0 https://www.windowscentral.com/microsoft-explains-windows-11...

Can anyone please explain what TPM (2.0) is and whether it works for or against me?

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Basically a TPM chip can be used a secure key store. This allows to use digital signatures to check if the boot chain, kernel or modules have not been tampered with.

In practice, it's mainly used for DRM.

TPM is to secure software and data from the user. You no longer own your computer.

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