There's something about "rum" flavored tea that seems very unappealing to me. The last thing I want to think about tasting when I drink tea is any type of alcohol!
Also, when I make a signature blend, I try to take into consideration which is the strongest and most pronounced flavor, and I try to tone that down a bit to make sure the other flavors come through. I've had blends with chai in the mix and it seems that it's a flavor that can easily over-power others. I like chai, but if I'm going to make a purchase of a blend, I don't want it to taste like just one thing.
So instead of just criticizing, maybe I should be more constructive by explaining what I would do to make a better spiced apple blend: I would make it 40% spiced apple chai, 30% sour apple (herbal), and 30% vanilla (black). I think the vanilla would smooth things out a bit. I think I add vanilla to every blend I make!!