I temporarily don't have my books, so I can't see the exact quote, but can't this be resolved as being both? Binah is the both the dark infertile mother of form, and also the bright fertile mother sending on the rules to Chesed. Chesed, too, has a dual nature of accepting from above and sending below. Except for Keter, all emanations contain their own contradictions.
Certainly it can be both ... and more. Geburah contains form and passes it on as it 'inherited it' from Chesed ... and the ideal form came from Binah. I see all the spheres as containing the energies (or form of the energy) of the sphere 'before' them.
It is the form structured by Chesed that takes on motion in Geburah, as it 'comes out' of Geburah it is 'force'. Now the ideal form has form and is in motion ... the from now has motion. I don't see the motion as describing anything else other than a state that form can be in.
Binah is Saturn as the constructor of forms (hence limits) 'going down' the Tree but the liberator from them 'going up'. One could see that as a wonderful free liberation or a process of destruction (depending on the position of view).
Kether may not contain 'contradictions' ( against unity) , but that does not make it immune to working in dual aspects.
Now I have done it haven't I ?
(covers up, protects head and ribs)
What I mean is ... it still 'receives' and 'gives out'.
Or; 'God' 'retreated' to make 'space' for 'God' (Kether) to manifest. (Does western Hermetic Q/K/Cab/bal/la have Tzimtzum ?