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I made a portable Linux drive that boots on nearly any computer
Having a Linux live USB can save many headaches if your main PC has issues, but they're also useful as portable OSes that you keep with you, and plug into whatever host machine is nearby. For them to work like this, you need a bootable USB that will run on a wide range of hardware, and that's easier to do than you might think.
While you could run Windows 11 off a live USB, I wouldn't suggest it for long-term use. It's more of a "we can do" than a "we should do" thing, and Linux is much better suited to the task. If you've got a home lab, you probably know this already, but even Windows users can benefit from having a Linux live USB lying around where they can easily get to it if something goes weird with Windows.