Having been trad for so many years, I certainly don't think I'm any better now I have gone WFP.
Same guy, just a different method that's all.
I watched a guy last week using WFP, he had a van mount with a 100 psi Flojet, pushing water out at such a rate I could hear the water hitting the glass from 40 meters away. He had garden hose running to his pole hose, and that must have been 8mm diameter. This was a totally unrestricted flow, and to make things worse one of his jets was blocked. I am not kidding a single jet of water was landing 25 ft away from his brush. This guy wasn't rinsing, he was power washing. Brickwork, vents, everywhere was getting blasted. He then said that WFP was not all it's cracked up to be, he had been getting complaints.
I know for a fact that he has never learned trad methods, he does insides with a spray bottle and microfiber cloth.
I believe that we have benefited from all those years of trad cleaning, it gave us a feel for the job, we learned to treat glass with respect, especially when cleaning the old fashioned leads and single glazed panes. I for one think I am a better window cleaner for having put my time in cleaning trad. Dai