From reading the forum, these are my thoughts on the subject.
Most traditional window cleaners know how to clean a window properly. They understand the safe practice of using ladders. Once they adapt to WFP they understand how to use it quite quickly, and usually end up doing a good job.
WFP has made it easy for anybody to become a window cleaner, however if the wfp operator has never done traditional cleaning, with squeegees, scrims etc, I think they will help give the WFP a bad name amongst customers, because perhaps they are not good enough window cleaners?
Even though my business will use WFP wherever possible, all of my staff will be taught how to use traditional equipment as well, back in the old days I would teach staff thoroughly how to use ladders, squeegees etc, and believe it takes about six months to teach and train them properly. With WFP teaching traditional methods will take the trainee considerably longer?