You're lucky. I can't sweat at all on the whole top of my body, and that really sucks. I think the majority of happy ETS'ers are palmar HH to begin with, and have had a surgical result that still allows them to sweat from the head.

People who can't sweat from the head anymore are must less happy overall. Then you need to factor in all the other problems, like thermo regulatory issues that some fight more than others, and the heart problems.