I get what you are saying but that was a TPM requirement. We don't know and there have been NO indications that Microsoft will require a newer version of TPM to run Windows 12. If TPM 2.0 were not required thos 5-6 year old PC's would be able to run Windows 11. That seems to be an anomaly rather than the norm.
If you can run a laptop or desktop in Windows 10 you get all of the official security updates until Microsoft no longer supports the OS, which Windows 10 is still being supported. So the example of using the 2006 ThinkPad running Windows 10, it would still be current today so currently that's close to 18 years of official support.
Windows 10 really has a much higher user base vs Windows 11. So the group that would want to extend the life of their laptop or desktop that is officially unsupported by Microsoft would be small. But even so if you can install Windows 11 on an 18 year old laptop, you would get official OS and security support from Microsoft.
According to the latest Statcounter figures, Windows 11 reached its largest-ever global market share in January, hitting 18.1%. Windows 10, in contrast, has seen its share fall...
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