Now that I think of it my dislike of helmet weight likely stems from wearing a composite helmet when I was in the army. That thing can get your neck really sore after a few weeks, but also does grow some nice neck support muscles.

Still don't like to wear a useless styrofoam pot that still has worse ventilation than no helmet at all.

People here like to rave about useless weight but no one questions a helmet. If touring was a dangerous form of cycling like DH or Freeride I'd get it but usually it's not. My touring is typically relatively slow with a ridiculously stable loaded bike. It's safer than my commuting, which also is extremely safe