macOS receives 1 year of full support and 2 additional years for security updates for each version with 6-8 years of upgrade eligibility. Windows 10 received 10 years of support (on top of a free upgrade from Windows 7/8.1 for most users).

I'm not sure why you're counting the years of support for a version of the OS and not the years of support for a computer. The interesting thing is: if you bought a computer at year X, does it still receive updates at X+Y?

There's loads of relatively young computers which can't upgrade to Windows 11 and therefore aren't supported anymore. That's the problem, not how long Windows 10 was supported.