Generally people only buy new pc's when their old one stop working.
And for the older PC's upgrading the OS in place is not an option like it was from 7/8 to 10.
Because the hardware requirements like the TPM and a "modern" processor.
Even if I wanted to use WIndows (I don't as a Linux user), Windows 11 would be a big no for one simple reason:
I work with sensitive data. On the level that the GDPR is only the tip of the iceberg,
Windows 11 with all it's build in spyware is NOT compatible with the data protection laws I'm under.