Re: Corbyn's broader and more useful aims?
"repeal the Town and Country Planning Act 1947 and succesors and don't replace it with anything at all"
As long as building regulations control isn't repealed as well, and there is some sort of overview so that you don't get a ten-mile long road with houses filling both sides meaning it's impossible to develop the next bit of land out as there's nowhere to join on an access road.
Rolling with your argument about big one-off decisions vs small multiple decisions, building needs regulating (the building itself, not the permission to do so) as it's one of those big rare decisions. You can't say: oh this house fell apart around my ears, I'll not buy another house from this company next time.