Idk man. Homelessness will kinda suck anyway, because you have no place to rest, usually struggle to get enough food etc. Bad weather will make things much worse. Solitary is considered to be one of the worst kinds of prison sentences, unless you’re like a target for others for some reason. And high school can go either way. Mine was great, but it can definitely suck for some. But without others, how exactly is it a school? Maybe in some extreme cases of bullying, it might be better, but I think for most the loneliness will be far worse.
I don’t get this argument for practicality of classes. There shouldn’t be any budgeting, taxes related classes. You know basic math, an one hour YouTube video should be enough. For more complicated taxing situations, you’ll hire an accountant anyway. Cooking can actually be nice to learn, but definitely not in primary school. Some high schools actually do have optional cooking courses. My school called it Home Science. For job hunting, most schools do career counseling towards the end of high school. And home repair etc. should be taught by a parental figure. Not everything can be done in school. School gives you the basic tools so that you can learn whatever you need to learn to make a living.