Yes, it’s an oldie. 
Besides other delays (life etc.) it turned out more complex than I anticipated to make everything function together well and number of animation pieces, and I thought one “size” was too limiting, certainly for folks doing quality cinemas and not procedurally hacking/altering the movement in an animation “system”. Plus, having 3 very different size “rises” makes for more choices as a starting point for a procedural system, I would assume.
BTW - sent you a PM.