If I had a flysheet and teabags and were hunting goat up high in the tundra of Montana's Beartooths, come the next thaw I'd be a tea flavored popsickle for some grizzly.

Taking minimal gear is nice and romantic, but as they say, "an ounce of prevention is worth more than a pound of cure". I'll be prepared for anything and be a bit overgeared thankyou. You might end up with sub zero temps or a freak storm and your screwed. Why risk it?