I think that's a fair point. But I also think that the education system should have a levelling effect, where it doesn't matter who looks after you when you are

I think that's a fair point. But I also think that the education system should have a levelling effect, where it doesn't matter who looks after you when you are at home - everyone has the same opportunities to learn. Students' parents, guardians, extended cohabiting family, etc. have an impossibly diverse range of skills (and ability to communicate, etc.). Even if these people were available at all times, they remain a hugely variable source. If we're saying that practical life skills are important, we should aim to provide a consistent experience to avoid inequality in society. I'm sure everyone has stories about how the people who raised them taught them a few things well and were terrible examples of others. Some of these will be funny, but others can have life changing consequences.