This is like saying "why don't you just teach your cat to use the toilet instead of using a litter box?". I mean, yeah, that sounds awesome. Given infinite time and energy, I'm sure it's possible. Best of luck to you, though.
And I don't say that to be rude or disparaging, it's just that parenting is a little like war: your plans never survive contact with the enemy. I had similar thoughts and ideas before I had kids, and they all went out the window when you deal with the real thing. Sleepless nights, a screaming infant, being scared out of your mind when they're sick... but then you will find a calmness unattainable anywhere else as you hold your sleeping child. All of your accomplishments will pale in comparison to the joys of parenthood, and you will unironically look back at those years as some of the best years of your life. You will see.