That seems unfairly knee-jerk. Nalgene bottles are very good at doing the thing they were designed to do- being water bottles for hiking (it's fairly noteworthy when I see a hiker drinking out of something other than a Nalgene bottle). To fit in cupholders, they'd have to have a much smaller diameter, and thus either hold much less water, or have a "layered" shape (like the large drink sizes from fast food restaurants). Either of these would be a major compromise.