I think that anyone who remembers how Long Axes were when they still had a 2h mode will object to that suggestion
They are not made for it, and the thought that you can just give all polearms 2h animations is a wierd one if meant seriously, first of all the grip would make no sense, and second the weapons have the stats they have because they were balanced according to their model and animation.
Giving polearms some kind of lolstab animation fix like the one 2h has received would probably be a good idea, however. But in general poles as for example poleaxes have always had a too centered grip in WB, where a wielder IRL will let the topmost hand slide down the shaft to add reach to attacks when needed.