No offense taken, it's a relatively new idea as far as the general public goes. Detailing sites are made to discuss new ideas and techniques.( Here at Detail City, we always try to keep it friendly and civil:bigups ) Many classic cars ,street rodders and antique owner have been using waterless washes for more than a decade. Many of these owners prefer no to put hoses on their cars in fear of getting water trapped where they can not dry it thoroughly, and it helps prevent premature rusting in areas they can't reach (inner fenders , frames, drain holes etc.) as many older vehicles were not made with today's anti-rust techniques.
Some can be used as QD's depending on what you want out of a QD, but a true waterless wash has only cleaning ability not sealants or wax in them.
Can they remove heavy dirt in a pinch, yes, but they are not economical that way...I would recommend at least going to a selve serve wash and rinsing for heavy dirt, mud, or winter salts and sands.