Would totally hire someone if they proved competence in software development while also not owning a computer.

Tells you they are an extremely competent smart worker that could be surprisingly helpful in ways we don't understand.

I'd love to learn from such a person.

Why? Some people like to spend their free time doing things that aren’t what they do all day at work.

I knew one software developer who basically spent all his free time outside hiking and camping and rarely did anything with a computer when not working. He was a good dev and very competent. Just after being cooped up inside on a computer all week he didn’t want to spend more time on one at home.

It’s not much of a stretch beyond that to simply not owning one.

Like I said, you could own one and it's broken. Your 5 year old knocks over a glass wine the night before a morning interview. What do you do? The fact you can't work around it also might reflect badly on you as a potential employer.