DD is 11 (would have started secondary this month) and has been home educated since halfway through Year 5. It's the best decision we've ever made.
To answer some of the points raised in the thread:
My daughter socialises more, and in a healthier way, than when she was at school. Some of the children in her class at school were being encouraged to grow up far too soon (unlimited access to social media and neglectful parents leading to concerning situations, including one where DD's picture was taken covertly and shared by a fellow year 5 pupil to hundreds of strangers who were his Snapchat contacts. His parents didn't give a shit). DD goes to various groups; some are home ed specific and some are not - bouldering, theatre and Guides as examples. She has also learned how to interact with adults, without the teacher-student dichotomy that can harm how that skill develops.
We track my daughter's progress in various ways, most of which are used by teachers. Age-related expectations are easy to find online, as are past papers of tests for different year groups. We track her progress and development of different skills and report on this each year to the local authority.
There's no set way that home ed families educate, as there are lots of different styles, but we do a full mix of "life learning" and sitting down with online recorded sessions, textbooks and more. We do science experiments, we do field trips, she learns languages and musical instruments and cooking and all sorts.
We ask her frequently whether she's still happy, whether she wants to try a different approach or whether she wants to go to school - she may ask to tweak our approach (more worksheets / more life learning / a specific subject she's interested in) but she is adamant every time that she doesn't want to return to school.
She sits her first GCSE next May.