Sometimes it can take a lot of practice to learn to cook well. We don’t always get something right on the first go. Too many people give up and say "I can't cook" without giving themselves time to develop the skill.
It's a good question in a world where convenience is the norm.
So why, exactly, do I cook from scratch?
When the boys were little we always had a vegie patch and they would graze straight from the garden, eating fresh snow peas, cherry tomatoes, carrots, corn and cucumbers. I never had any trouble getting them to eat their vegetables. They loved salad served on the side of everything or crispy steamed vegetables. Picking food from the garden always helped the grocery budget too! Although they managed to chew through the harvest like locusts most of the time. But who could complain when they were getting so much goodness!