Is there a good reason (other than licensing and Linux as an alternative) I shouldn't use Windows Server 202X as a Desktop OS?
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I am on a 10+ year old Laptop with Slackware, for desktop use it is just as fast as any modern Laptop with Windows, I would even say it is faster.
Also you will find Libreoffice is just as good as M/S Office. Just ignore the fud. FWIW, I believe many foreign countries will start migrating to Linux and I heard that is already happening in China.
Old Intel based computers are terrible for power usage. Modern computers that are ARM based are much better for the environment.