Read his book "Stumbling on Happiness". He addresses the first two of your concerns, and it's a fascinating book. (As for your third point, I think you missed what he was trying to say: that if you create a myopia around any one thing, it tends to exaggerate its effects.)

And you're right that there's more to life than happiness, such as fulfillment and love. Being a Dad is, like the Marines, the hardest job you'll ever love. I wouldn't change it for the world.