Is there a particular reason why neck pickups on guitars are often placed exactly where an open string harmonic is found ? Years ago I suffered from 'lost harmonics' till I realised that the one directly over the neck pickup won't sound if only that pickup is on. It was trying to pick up the part of the string that was NOT vibrating !Switch another pickup on, and the same harmonic can be heard.
Yes, pickups are places to take advantage of string harmonics. In addition to additional harmonics, there are harmonic deadspots that you would want to avoid as well.