A home educating parent doesn't have to mirror every element of a school-based teacher's work, though.
A teacher has to deliver lessons to meet the objectives and needs of an entire class. Options available in home education can include: 1:1 private tutors; a tutor or a parent with relevant knowledge/skills coming in to teach a small group of home educating children; a parent delivering 1:1 education. Those options mean a lesson can be planned to meet objectives for just one individual or for a small group, rather than a full class. That means things like learning objectives, settings for learning, etc can be individualised in a way that isn't possible in a school classroom.
School lessons need to be delivered in a particular timeframe (a certain number of hours per day/week/term, within a structure of school start, finish and break times). Home education doesn't have to stick to that. Things can start early, finish late, take place over 7 days rather than 5, not follow school terms, etc. It can be designed around the strengths and needs of an individual child.
A lot of a teacher's time is also taken up with transitions between classes (introductions, wrapping up, children moving between rooms), managing class discipline, managing class safeguarding and pastoral care, etc. It can be much easier to manage transitions for one child you know well, rather than 30 you don't know that well, especially with the ability to tailor transition timings and approaches to what's best for an individual. It's easier to maintain discipline for one child (and can be done in a way that works for that child) rather than 30 - it's even easier to work with a child who has severe behavioural difficulties on a 1:1 basis rather than within a group of 30. As with the majority of parents everywhere, the majority of home educating parents care about and want to protect their own child, so child safety remains important - 1 child is a different setting than a class of 30, and safeguarding needs can be prioritised without having to juggle this against the competing demands of a full class. Things like bullying by classmates are far less likely in a home education set-up, and where issues arise, they're more likely to be picked up early by adults who will take the victim's experiences seriously. Bullying by teachers/school staff is virtually removed as a concern, but if there are issues with tutors, again these can be picked up early and taken seriously.
Being a good home educator is hard work. There are differences between home education and school teaching that mean the two don't require the same skills in all areas, though.
Another thing to consider is that there are classrooms across the country where whole classes are receiving lesson time delivered by people who aren't 'trained teachers' or who don't have specialist subject knowledge or familiarity with classes.