I think you don’t tech professionally.
You don't need to tell kids things that are misleading nonsense. It only confuses them more. You can be precise and high level at the same time.
In no sense do computers struggle with digits. That's a misleading confusing statement and it's not appropriate at any age.
I don't know whether you mean "teach" or "tech" here, but this seems to be an ad hominem argument.
Regardless, I would submit that clarity and correctness matter both in teaching and in tech.
Correctness, of the sort you are implying are absolutely not appropriate at all levels. There’s a reason kids in second grade are told that you can’t subtract a larger number from a smaller one, for instance.
2. In grades 1-2 (iirc) we applied negative numbers when we talked about the number line (which we had on the wall.) Even preschoolers knew about negative temperatures on the thermometer.
3. See PP's original comment.