The longer I have hunted the less I leave behind. I don't fault anyone for using whatever method they want or leaving the parts they don't eat or can't carry.
But I no longer leave the heart, kidneys, or liver behind. I am trying to learn how to properly cook the heart. But even if it does turn out, I just feed it to my dogs.
When my kids were all home and hunting, I used to process 3 to 5 deer per season. I always take the neck meat, tenderloins, rumps, and backstraps for our consumption. I cut the front shoulders and leg meat into strips with the connective tissue attached and dry them for dog treats. My dogs love them! I feed the front and rear leg bones to my dogs. I freeze some of them and dole them out throughout the year. They love it! I feed the liver and kidney to my dogs as well. I now only leave the rib cage. Sometimes, I even give my dogs the hide to chew on. Yes it makes a huge fur mess in the backyard, but they love it! Why give it all to coyotes?