Not so much "Borked Forever" as they are "Extremely vulnerable and a super bad idea to keep connected to the Internet".
When Microsoft truly stops supporting security updates for Windows 10 (October 14th, 2025) then every new vulnerability found in Windows 10 from that point on will just be... Wide open. Meaning that the more time that goes on, the less safe a Windows 10 machine will be. Think of it like this: If you're running Windows XP today, and you connect that machine to the Internet? Yikes. Don't enter any credentials into it. At least none you care about keeping secure.
Any Windows 10 machines out there can of course be air-gapped. But then, chances are that's going to be a machine of very limited utility.
There's always the option to move to a different OS that will support the hardware and remain secure with additional updates, but I'm not really qualified to speak on that.



