I don't want to slam your well put, positive point, but this was not true for me at least. Getting married and having kids has motivated me to work hard and aim high - I could have (and did) sat around on my ass playing video games for the rest of my life. Different strokes for different folks, but I'm a far more driven person after gaining responsibilities than before.
I think you misinterpreted OP's comment. He meant that having a child completely neutralizes the petty stress of the daily grind because you have something far more important.
For me, having kids amplified the daily grind. I hated leaving in the morning before they got up, and returning after they were in bed. Luckily this is a profession where at least some aspects of the grind are optional, and now I work remotely full-time.
I don't want to slam your well put, positive point, but this was not true for me at least. Getting married and having kids has motivated me to work hard and aim high - I could have (and did) sat around on my ass playing video games for the rest of my life. Different strokes for different folks, but I'm a far more driven person after gaining responsibilities than before.