I hear this criticism a lot, and i have to say that it doesn't really hold up to me, unless i am missing something. Plenty of people make good money only using 12V's to clean houses with.
As far as applying the chemicals, who cares how the chemicals get on the house? You could put your mix in a coffee cup and throw it at the house, and still get it clean. I see no clear advantage here, especially when you consider the new proportioners where you can adjust your mix on the fly, and go from roofs to wood to vinyl instantly.
Height? About the same, no? I know the 12V's can use those carbon fiber poles to go up pretty high, dont know about pressure washers.
Rinsing? I guess pressure washers have the advantage... but booster pumps can narrow the gap.
There are pros and cons to either method, of course... so what's the big drawback? Is it just the speed of rinsing compared to a pressure washer?
Dont get me wrong... i dont have enough experience to know all the pros and cons here... but if they are as useless as many people imply, then why are so many people assumably hitting their daily goals with them?