It becomes harder in high school. Many home-schooled students attend regular high school when they are ready for it. And they are ready years earlier than those in the state-sponsored track.
Don't imagine that the average parent can teach a class of 30 better than a trained teacher. Nor can they tutor a single student better. But neither of those things is happening.
The average parent can tutor a single student better than a trained teacher can teach a class of 30 (or 40). That's the tradeoff you have as a parent. And yes, you sure can do better.
Consider: if that teacher did nothing but give individual attention to students all day for 5 hours, your student would get 10 minutes of individual attention per day. You can do that in the first 10 minutes of your home-school day. You can do 10 times better than that. In fact home-school 'school days' are generally just an hour or two, during which the student progresses further than the public-school student does in 5 hours.
And its just an hour or two a day. Doesn't have to cramp your career at all. Or you can team up with others in your community, take a day a week and do what you know, leave the rest to the others. Now your child is in a group of 4 or 5, still manageable, still valuable to have the close attention of their teachers.
Very early in the morning is a great way to start the day. Young kids are never brighter than in the early morning.
If its not worth the effort to work full-time and add in home-schooling, then I'm sorry but it may not work for you. It sure does work easier if somebody in the household works part-time. I should say, works outside the home part-time, and works in the home part-time. Because the more you put into it, the more you get out.
It depends on the weight you give your kids in your life I guess. And the condition of your local schools. Maybe its not a problem where you are.
But if your schools are not the best, its a tragedy to consign your valuable child to a 6-year sentence in a rough environment. With a half-strength education and a poor start to life.
Also much of home schooling is done as a correspondence course, which typically comes from a private school (these schools, usually religious in nature, have regular classrooms, and have home-schooled students which are considered part of the class, and they have periodic meetups available for field trips and stuff). In these cases there is a teaching staff to back up the parent, which provides homework and testing material, and sometimes phone support too.
Who comes out of high school with "expert knowledge" in anything?!
The same could be said for a lot of university degrees for that matter.
Public education has only been a "normal" thing for a century and a half or so. It's certainly not the only way to turn out a competent adult, and that's assuming it actually does, which is becoming more and more questionable.
And who said kids must know those exact topics and not others? Why do you think when you have the liberty to teach your kids about the world at home, that you still need to follow the government curriculum?
Open up your mind.
And I have my mind fully opened to the idea of home schooling - I just have not seen a single compelling argument for it yet. If such is provided I will support the idea fully - but for now for me it looks like it's just a waste of time and money.
The money is a sunk cost, no getting that back. And the real waste; the real cost to you is the education or lack of one that your child receives.
If you don't value your child over your tax bill, then maybe home-schooling isn't for you. Just lob your kid into the public school and feel like you're getting a bargain; I sure won't be there to stop you.
But if you can afford the time and effort, then home-schooling is a whole different process with a substantially different goal. Instead of babysitting its about engaging your youth in lifelong learning. Its got the advantages of personal attention and customized plans. The child is relieved of the risks of institutionalization, while taking advantage of the facilities as needed.
Its not such a radical notion, to manage the education part of your child's life in much the same way you provide food and housing. In America, home-schooling before the modern age had a different name - it was called 'schooling'.