Look at the Trump trials, he could eke it out until the end

You could argue that his oath of office requires it. But yes the Supreme Court only meant this power to be used by people they approve of

Trump has 88 really good reasons not to drop out. Without control of the justice system he’s going to be in jail for the rest of his life and republicans have shackled themselves to him.

To deliver value to our shareholders

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