I dont see what purpose they serve. From reading threads on here, they dont seem popular with teachers (having to look after kids 24 hours a day, no extra pay), they are very expensive to parents (in hundreds of pounds) and potentially children feel left out or excluded if they aren't comfortable to go or parents cant afford it.
An a level geography course maybe requires a field trip, but primary children dont need to do expensive outdoor pursuits as part of their curriculum. I never went on one until age 13 and I'm perfectly independent as an adult
. Aibu, am I missing something?