I do quite a bit of traditional work still so it wouldn't bother me too much if I had to use that method full time. I would have to drop a few perhaps who would be too difficult/dangerous/time consuming to do with the ladder but I'd still keep the round mostly intact.
There would be one or two benefits in that I wouldn't have the hassle of purifying water anymore and lower costs related to buying the sometimes pricey WFP equipment.
That said there would also be some drawbacks of course in that very windy weather would become a problem and work would be done slower. The frustrations of doing trad work like problematic detail work, leads in the rain, squeegee lines etc would also be intensified.
I do find though that customers of a certain age (as in the more elderly ones) seem to prefer the traditional method so maybe it would be easier to pick up new work if fully trad should more customers ever be needed.