One of my family home schooled her DC.
While it worked well when he was primary school age as he got older it became more difficult, particularly in rebellious teens. Ps not academic or particularly well educated so maths/languages/science was barely touched. They did use online material, but my impression was that structure was missing. Interests need to be encouraged, but some basics have to be addressed.
DC never learned to cope with everyday social life, being aware of other people and their needs. He did join a football club, but stopped going. He is what I would call socially incompetent, unable to initiate conversations and uncomfortable in company. I think he's quite lonely
DC eventually went to a college on a course specially set up for home schooled children. He didn't take most subjects, failed maths (badly) twice, although he did pass English, and did well at domestic science (home technology). He's good with computers, I don't know if that's just games.
There were annual visits from the council, but possibly not looking in any depth.
I guess this one of the saddest scenarios, but probably not unlikely. IMO DC will find it difficult to find employment, or to keep it. Sad because he's bright. I also think that he's going to have a hard time socially.
I feel his life has been badly skewed. Hopefully he can overcome this.