Windows 10 gets three more years of security updates, if you can afford them::Windows 10 gets a version of the program that extended updates for Windows 7.
“Don’t have to” and “don’t” are different things. I’ve never been in an enterprise environment that kept PCs much beyond their 2/3 year service window.
In fact, they messed up and got consumer hardware once. They EOLd the devices at 6 months when they realized they only got a month of support.
Really depends on the industry I guess…we meet a lot of old XP and Win7 machines when visiting sites. Engineering stations rarely get updated unless the hardwares breaks, and a lot of software used to service the machines/production line from the engineering station often don’t run on a never OS.