I don't care about the quality WFP gives; it only has to be 'good enough', and it most certainly is 'good enough' for 99% of customers.
The 'bottom line' is what matters and with WFP we can smash large chunks of work out very quickly, safely, and with a lot less physical effort than anyone can on ladders.
Which enables us to get by quite nicely on three-or-four-days-a-week.
If anyone wants to be obsessive about having 'perfect windows', fill your boots.