I think comfort/discomfort is a highly individualized thing where your range gets calibrated by your experience, and that modern western lifestyles have created a very narrow band of what’s comfortable for many people.

I’m a big Type II fun person and feel that there are all sorts of highly satisfying life experiences to be had if you’re able to tolerate some discomfort, but there has to be some deliberate practice of getting comfortable being uncomfortable to ease into it.