The worst part of the whiteboard in my opinion is not that it's a poor tool for the job, which it is, but that it adds both unnecessary social pressure and the

The worst part of the whiteboard in my opinion is not that it's a poor tool for the job, which it is, but that it adds both unnecessary social pressure and the need to constantly explain what's going on (presumably because the interviewers are bored so for their amusement) while simultaneously trying to think, write, and edit out a solution. The fact that you can't run or even edit code very efficiently on a whiteboard (or paper) alone makes it a terrible tool to judge anything about a candidate, but combined, the two make the whole exercise pointless and quite frustrating for the interviewee.