The crux of my point was to highlight that parenting is never as simplistic as the previous comment ("All ya have to do is tell them to eat or go hungry!") may have made it sound, not to suggest that you can mold your children exactly as you would like.
Edit: And your point about some kids being pickier than others is actually exactly my point. That's why I said it's not easy - it has taken a lot of time and patience for us to get our children to this point. I've heard stories of parents struggling for over a year or more to get a kid to break certain eating habits. It's not just picky eating, though - correcting various aspects of a child's personality requires a LOT of time and attention, often over the course of years. That's why I took an issue with OP brushing it off so casually.
But yeah, it's absolutely not as simple or easy as, "Well, if ya don't eat you'll be hungry" - because congratulations, now they will carry that hatred towards that food with them and it'll come out the next time you serve it to them. And even then, if they're not picky, cooking still takes time because there's a kid running around who often doesn't give a shit about the fact that you have to tend to whatever's cooking at the moment, or they're too little so you need to modify your food prep in order to eliminate/reduce choking hazards.