Windows 10 came out in 2015, 10 years seems like a plenty decent lifespan.
Windows 11 came out in 2021, so 10 users will have had 4 years to upgrade.
Windows 10 was supposed to be the “last version” of Windows and Windows 11 requires a lot of hardware that older machines simply don’t have, most notably TPM. Microsoft creates thousands of tons of ewaste for no reason and the owners of this ewaste have to spend thousands or millions to replace machines that are perfectly fine.
Yes, you can circumvent these restrictions, but not as a business.
Do they even make business class computers without TPM chips anymore? To my knowledge it has been a standard feature for years.
a) it’s not only about business class machines b) There are still millions of computer that are perfectly capable of running Windows 11, except an artificial requirement called TPM. My 2014 Haswell machine (that I’m typing this comment on) is not “modern”, but can be used for 99% of “non-gaming” tasks just fine. But it can’t run Win 11. I personally run Linux anyway, but you can’t require that.