And yet, one of those sells significantly better than the other one.

I don’t think Lemmy is a platform where such disclosure would be necessary. What difference does it make if OP discloses this or not?

I understand a tablet, but using a phone for the second monitor?

I think realistic nobody will actually think about this in the moment before hitting someone. And if they have enough time to think about this and they have enough control of their car to choose who they hit, then they have enough time and control to stop.