Good tasting apples are more common than we are led to believe; my town has many naturally recruited (not grafted) apple trees that bear edible fruit. They are on some hiking trails and in mountains and generally in places nobody would think to graft a tree. Are the apples store quality? No. But they are tasty enough, and edible while you’re on a hike or whatnot. True that for every one of those, there are many crab apple trees though.