I agree. The handling advantage of KDSS may be greater on paper, but when it comes to cornering in a high center of gravity BoF SUV, an upgraded suspension is plenty good enough. The 4R will never corner like a WRX anyway.
The only argument for KDSS for people who modify their vehicles that I see is the extra flex offroad. However, that again is really a stock vs stock comparison. I do have extra travel with my 6112s/Icon 2.0 combo.
Yes, there is a "buldge" on the driver side frame rail in the middle of the vehicle which contains whatever hydraulic pump the system uses or something like that. Also, the front sway bar is completely different, much larger, and despite all the protestations of some KDSS owners, there is 1" clearance loss at the front of the factory front skid plate with KDSS vs any other model. If they are next to each other on the dealer's lot, you will easily see which has KDSS by looking frontally at the row of parked 4Rs. The KDSS have visibly less clearance at the front edge of the front skid.