Because its getting really annoying that i can't command her to do anything. Pick the novice lock, "Can't do that", loot container "Can't do that", mine oar, "Cant do that", flip a switch, Cant do that?", pull a chain, "Cant do that.

Its very annoying. Is there any other follower that can do at least one of these things. If not why do they even add the option to command them, if they lack the capacity to even open a single container.