I generally don't use pinch harmonics much anyway (hmm, do I not use them much because I'm not great at them, or am I not great at them because I don't use them much?), but if I'm playing lead with the neck I'm generally not inclined to at all, as I think they're somewhat at odds with the tonality of the neck pickup. Also, I'm not denying that you can produce pinched harmonics on the neck pickup, but they're undeniably better from the bridge pickup.