I've got a tree that grew from some Macintosh seed. It's loaded every year and I haven't done a thing to it ever. No spray, training, pruning, etc.
it also survives getting overly watered from a neighboring irrigation, which has killed every cherry tree, strawberry bush, pear and apple that the irrigation touches. Pisses me off
My only issue is it fruits so early. If it would drop in October, I wouldn't be growing anything else.