I was a bit of a crunchy mama in the early days - home birth, cloth nappies, forest school groups etc. I know a lot of people from these that have HE the whole way through.
I found the certainty that school was bad and negative from the off a bit much and there was more than a bit of exaggeration and conspiracy theorising going on about the harms of mainstream.
I am still in contact/SM follow with a few of the families who HE and they all wrote a lot of posts about how brilliant their experience of HE is and how wonderfully their dc are doing. For some I think it is true, at least in part.
However, they have often only hang out with other families who HE and have very similar lifestyles and views. Their dc have to just muddle along with whoever turns up to HE groups and that is often not dc of the similar age or interests as them. They don't seem to be academically anywhere close to where my dc of the same ages are and they only take one gcse at a time and don't do that well even then. These families are either really low income due to parents not being able to work much as all dc are at home all the time or the parents do work and their dc spend huge amounts of time on screens and responsible for younger siblings.
I find the sm posts of how going to the beach/woods/on a bike ride/swimming pool is home ed etc really stupid. My dc do all those things and also go to school. The idea that families who send their dc to school then do no wholesome or improving or outdoors or topic based activity outside of that is a bit blinkered.
For the pp stating their dc had done gcses and gone to college or work at 14 - that to me sounds awful and a horrible early adulting of your young teen. I would much rather engage with the education system and allow my kids to develop in an age appropriate way.
I like the idea of early years HE and of being less formal and more time outside for young kids. For older ones it never looks remotely tempting or successful for any of the parties involved.
That said, I think people should be free to be as weird as they like to an extent. I wouldn't do it and I don't envy them but I wouldnt want to be part of a system that removed choice.
I think forced HE due to lack of support and provisions is a completely different issue, different reasons and different outcomes.