Personally i see it as a precursor for things to come. For example doedi and anky could both use the weight reduction for their respective resources. And if a beaver can carry a anvil and be a smithy, then my anky shall have a refining forge! :D.
Not sure about the doedi though, its low level so its fine i guess...
Btw, you can use the beaver without a saddle, park it next to a tree and cancel its orders and it will chuck it. Kinda like a doedi with stones, just way harder to tame.