i seriously hope that moving leg was only considered for a set like this and not for further ones...
I agree.
The "PlayBig" figures had such moving legs, and I didn't like it much. The only thing it was usefull for is for aerobatics like shown in the picture.
In walking-positions and such, the figures would mostly just fall over when there legs where moved seperately. Playbig figures also had slightly movable feet (and removable shoes), but that didn't help much to stabilize them.