Do You Face Bias in Multi-Device Problems?

One challenge that anyone talking about attribution as to face is multi-device problems, which are becoming even more and more common these days. There's some work being done trying to correlate and understand that I'm one unique person, all these devices but it would be very disingenuous for anyone to say they've solved that problem. Yet there are people who are single device people, who have one machine, it's where they get everything from or maybe just a TV and a single computer who are easier to track uniqueness on because they truly are unique at a machine level.