QA1 Six-Link Rear Suspension Conversion Installed

I am in the process of getting my dart in to this century. I looked at the QA1 front suspension and was quite surprised when they said their system don't use the rack n pinion steering, just the old steering box, center link, etc, etc. I believe QA1 is in fact a respectable name brand in suspension, but why would they try to talk me into keeping the outdated steering components. Is there a problem with putting a rack in? Some incite on this matter?
theres a lot of people in the mopar hobby that dont like the idea of using Mustang II style spindles, which most other coil over kits use, HDK,GTS,RMS etc. Because of the angles and how the mopar spindles are, it's extremely difficult to get the correct geometry to go rack and pinion and use the rear steer mopar spindles. I'm sure Denny or Carl will chime in as to that as well. and if I recall right, the QA1 kit retains the factory Torsion bars which a lot of people like that as well.