Even the organic free-range chicken from Waitrose is often only edible if cooked in the pot or minced (or otherwise mechanically pounded into submission). Otherwise, it's often chewy, flavourless stuff intent on wedging itself between your teeth. I guess that's what most people expect.
Supermarkets are frankly a horrible invention and a good part of the reason we're in the dietary pickle we're in. They don't want to sell fresh stuff, and when they do, it's at a high mark-up, and they're more interested in shelf-life than anything else. Suppliers, of course, are squeezed. They'd much rather sell processed stuff that can sit on the shelves until it sells. Endless aisles of it, all branded variants of the same things, because that's choice. I remember once in my cavernous local 'grocery store' in the US contemplating an entire aisle solely dedicated to bagels. Identikit chewy dough made out of same additive-ridden crap in the same machines, the occasional minor variation thrown in. It's not much different here.
But having killed off most of the local food shops, they have us. And they're so profitable that multiple supermarkets can open within spitting distance of one another and spend most of the time half-empty, in part, because the taxpayer is paying a chunk of the wage bill.