I get the "getting out of your comfort zone" concept. Mainly because I do thrive from challenging myself (in ways I choose, obviously. I agree that being forced to challenge yourself is not a good thing). BUT I also have the tendency to be lazy and NOT challenge myself.
It's how some people are with exercising - you don't feel like doing it at first, but once you're actually doing it, it feels great. Laying on the couch feels comfortable in the short term, but if that's how you spend all your time, you'll end up feeling like crap.
So that is how I see "getting out of your comfort zone." People need a balance of comfort and challenge. That balance is, of course, different for everyone.
Independent polyperson seeking friendships, in which physical intimacy may or may not develop.
I do not wish to attach to any particular person. My love knows no limits.