A lot of the long-term support for OSes are for security updates. I’m sure they haven’t added new features in a decade or more but security patches keep rolling out. These cover not just actual bugs in the code but also addressing evolving standards for encryption, hardware insecurities, etc.

https://www.cvedetails.com/vulnerability-list/vendor_id-26/product_id-17153/Microsoft-Windows-7.html

The New Zealand version is also hilarious

Wow, the survey conducted by the company and spokesperson for the company all agree!