why not throw it out? whoa. not everyone can do that. i know i can't! and even if i could financially, it would be an insult to the planet and all other humans in the world who cannot afford good food. waste not, want not.
we raise our chickens from they day they hatch. we take care every day to feed them well and keep them healthy. then, when they are mature, we work our bums off killing and cleaning and carefully storing them for winter. after we eat them, i make bone broth from the carcass and feed the soft bones left to my cat. we put so much love and hard work into each bird. we throw none of it away.
even if you do not raise the birds, someone else does. dont throw it away.
re: pressure canners. i use one whenever i must. otherwise i would have to buy storebought (pressure canned) foods. when i can waterbath, i do. but i only freeze things that must be frozen for that, too has its drawbacks. even those things could be canned or dried but i prefer whole chickens for roasting so i freeze them. my life is so hectic with the kids, the farm that things like ready canned beans are a must for us, and that is where the pressure canner really shines.