It’s interesting I’m asking a question to learn, and being criticised for questioning a world I am not exposed to by the exact people who suggest home education has a lot more possibilities
How is it interesting? You've asking questions in what you admit is a slightly drunken state in an off-putting manner that comes across as wanting home educators to justify our choices compared to the school system when you clearly have the internet to expose yourself to possibilities if you so chose to do so. It's common sense that this type of questioning leads to less cooperative responses.
Basic research in this topic would show most home educators do not teach their children from the start until 18. Most British home educated children are those who were withdrawn from schools after significant issues there, most who return to school, often a different one, within a few years. Most of the changes both coming out of and going into schools happens around the key stages, though post-COVID there has been many shifts in home education and It's been noted a significant increase of withdraws around Year 8 with an increase of children studying GCSEs at colleges either in home education specific programmes in Years 10-11 (it's usually larger cities with this option) or post-16 programmes.
I think any adult who can't teach an able child to read, write, be confident in arithmetic, and basic knowledge of sources when there are many curriculums available has been failed by their own education. While some parents do not want to do this or feel they don't have the patience for it, and I don't think any parent should need to take on the whole of their child's education as many have had to do by the limits of the systems around us, the idea that you with your masters in engineering could not convey this information when there are tools readily available to support this - to me that says your education was rather poor. Being able to share information with the next generation so they understand is something most social animals do and even decades ago when I started home educating, there were open and go curriculums available. Many curriculums used in schools have 1:1 versions that are used by tutors, TAs, and home educators.
This understanding is what gave me confidence to home educate my children for most of their childhoods after my oldest, who is autistic and when small had very limited speech had a teacher exclude him and another autistic boy from class games that relied on speech. This significantly dropped what speech he had, and when I found out, I decided I would not send my children to school until they were able to communicate when they were being harmed. To me it was basic safeguarding. I wasn't trying to be better, I wasn't trying to be more able, I wasn't trying to do what schools do, I was trying to be safe and support the children I have when the system failed to do so.
Now, I've been blessed with four autistic children who never went through a why phase so the 'when kids ask' assumption didn't happen with mine. I did use curriculums based on finding sources, one for primary science called Science Detective which requires all answers to be sourced from the text was a great early exposure to this as it lead to natural conversations around what to consider when looking at sources, trusted vs sketchy sources, and similar. Many good curriculums do this kind of multitasking where it's for one subject, but builds in these skills and wider conversations. Also, sometimes the genuine answer is we don't know - it's okay to tell kids this. Teachers do it all the time, parents don't have to know everything either.