Probably a matter of priorities, fixing real bugs and adding features. Still, it seems like something that should take all of 5 minutes to fix in someone's free time. (I'm a programmer...)
Fruit trees actually CAN be stored, if you get them via a quest, you can store them instead of placing them. I've got two Lemon trees in storage still from quests that I didn't need to place.
Exactly, once placed, you can't store them. Must damage their roots or something.