Before you become a parent, you think it's easy. You think you can just decide things for the kid, and that's the way it goes. Especially if you're a high flier, everything just seems like it works out if you put in a little effort.
The thing that's really frustrating is that this is also a lottery. Some kids will actually simply do the thing that you want, and generally choose things that are good for them. Like my first kid. If I only had one I would think it was simple, and that everyone can just raise a kid who can read books for adults before they're ten, or do calculus before tenth grade, or cook a full meal for himself. I mean, you just tell them what you think they should do, right?
But you can also have a kid that will not do what you want. You will get all the same well-meaning advice about making it fun for them, explaining your choices to them, and providing incentives. These advisors are at a loss when you do all the things they said, and yet the kid still won't eat their vegetables. They don't want to read, they don't want to try the sports you take them to, and they are having constant tantrums.
While you think you are simply doing what you did the first time around.
As the kids get older, it also becomes clear that you are not their only parent. And I don't mean your better half. They get an awful lot of impressions from the rest of society, which you are not in control of. If everyone has a phone, you then need to decide whether you want to just go with the flow, or your kid is going to be the one without. If their friends are on social media, you then have to decide what you think about that.
Parents have the busiest schedule of anyone in our society. If we're going to hold them responsible for their choices, the least we can do is provide them with some sensible defaults.