Please don't hate on me, I know the name of the community, I'm just trying to explain.
To me it's the same as saying "You look like shit after you exercise". Well, yes, but it kind of misses the point of it. I'm doing it for let's say "a greater good". Sure, exercising is hard and at times you want to say "fuck it" but in the end you're more healthy, skinny and you feel better both physically and mentally. Also I don't value my own comfort that highly - it's kind of fun to push myself actually. Sure I could eat fast food daily but - I know myself and I'd get bored and would try to find some new challenge.
To me it's the same with children. If you don't have these feelings, that's fine.