I spoke to a few windys the other day who said that he didn't use wfp because he was too old to change, to much equipment to carry to work, over complicating an easy job, health and safety issues wth trailing hoses, hoses snagging, not managing to do rows of rear terrace houses, not easy to use if you have to climb over gates fences or garages.
How fast is wfp really? You gotta keep filling up your trolley from your 25L containers from your car, setting up and moving hose can take up time. Plus you can't get to do the back of number 58 because it takes to much work to either send your hoses over or drag your trolley full of water over. Wfp does have so snags.