Hillingdon
This thread was never about flexi / weekly boarding at 11 plus. It is about boarding at 7/8 and the OP's circumstances.
You can call it judgemental if you like, but we all have to draw the line somewhere. Would you say it is ok to board at 4? There comes a point where you have to take a view.
Parents' circumstances, or how many hours they work / don't work are irrelevant, as sending your child to board is always a choice. You have said this yourself.
My DC are in the London Day School system and I am totally aware that this does, in fact, mean we are living in a bubble - probably something like 90 per cent of the UK population will not have any experience of this and may well judge it all as totally unnecessary and ridiculous. It doesn't matter how many Saturday jobs my kids get etc. Of the children in independent schools, a fraction will board, so I think you just have to accept that in this sense and in the eyes of many, you are living in a bubble and people will take a view.
I'm glad it all worked out for your family, but please don't be surprised by the vitriolic views of people on this thread. Generally speaking, people will move mountains so as not to be separated from their kids. It's the most basic instinct we have and the reason why this issue is so polarising.