I don't get this "easier to get harmonics" question I see all the time here, its all in the technique and the ammount of distorsion you use.
I somewhat agree as I can get squeels with my Mules into my plexi AND the king of squeels (Billy Gibbons) was a PAF guy too and didn't seem to have any problem getting 'em.
Absolutely right that pickups won't cover poor technique. If you can't hit a pinch harmonic properly, miracles will not happen (sorry, bad pun :)) when you change pickups.
However, certain pickup/guitar/amp combinations are going to make it a lot easier for harmonics to really "jump" out of the guitar, as well as affecting the character of harmonic feedback/sustain you get. By no means is the pickup the only factor (or even one of the most significant factors), but it does contribute.
At least that's what I meant when I answered "MM by a mile".