Boiling chooks make a banging chicken soup...
Not many places sell them anymore which is a shame, though I've seen them on occasion in Halal butcher shops.
To a certain extent, food history gives us a clue - particularly WW2 and post-war rationing, when even the pig's oink went into the meat allowance. Once stuff came off ration, people wanted the desirable cuts of meat rather than the offal and pot luck pieces that they'd had since 1940. Rabbit suffered much the same fate, the "we don't want that as we can buy better." And so it kind of develops that "squick factor" for a lot of people.
Then of course, the advent of intensive farming methods, particularly for poultry. It made what was an expensive meat much more affordable, but of course at the expense of welfare and quality.
You don't see the cheaper / more interesting cuts of meat on a supermarket shelf, whereas I can get things like ox cheek and pigs' trotters, lamb hearts and locally sourced rabbits in the local butcher.