I think it may be because of the move to the modern hardware being limited to a single or double stand.
With the old hardware, just adding some extra parts to your stand meant you could readily hang 2 toms and fly 3 cymbals off the same stand. Not only did it mean fewer stands, but the look had an elegance to it that was distinctly Sonor, and you could do that by installing the parts yourself (instead of it being a "Factory installed option").
With the current hardware design, you have to use another clamp (multi-clamp, clamp with geared tilter, etc) to attach it to another existing upright tube to get the same effect. That can put a fair bit of stress on the clamp (depending on cymbal sizes and angles), and it's not as quick to setup/teardown and doesn't have the same visual elegance.
I absolutely get and appreciate the upgrades from the move to a more "universal" hardware platform though, particularly with the "Backwards compatibility" with their previous hardware. That's made integrating my 600 and 4000 hardware with my Phonic and Performer kits a piece of cake.
That said, there are some things I wish they would have figured out how to keep or use more from the previous generation - the lever-arm tensioners (love them on the 4000 cymbal stands and Phonic tom mounts), expandable tom/cymbal holders (via Z5507c prism clamps) etc.