I thought that ornamental crabapples served no purpose. Besides being ornamental, of course. And in truth, they are only really ornamental in the spring when in full bloom.
I just watched a squirrel for one hour run back and forth between the tree and his stockpile, carrying an apple in his teeth on every second lap.
For a squirrel, it isn't only ornamental. It's winter food.
Maybe it's even wine by the time he gets to it. And that's a good thing.