. If you take a yr 6 residential trip for example, the kids go to the next county and spend 3 days canoeing, climbing etc. Just them. I don't think it's any more educational because school take them, compared to if we took them, and it's all stuff we would do on a holiday together
That's all very well for the children who have families who either can or will take them but for many children the only place their families take them is to the shops.
You have families in poverty, families with several children, families where the children are carers, families where they don't have a car, families who cant go away because of older siblings doing important exams etc etc. All those children would miss out on the opportunities given by a school residential, why should they?
Just because you can take your children on such a trip doesn't mean that others should miss out.
My dc are lucky and get to travel a lot to many different countries but last year my Dd went in a residential to Scotland and went up Ben Nevis and did all kinds of activities that she wouldn't have got to do otherwise because we choose a different sort of holiday and made some great memories and learnt a lot.