i suppose the real old boys who were sammy the shammy
thought the same when these new fangled squeegees came
out,but things change jobs evolve and so does equipment.
i can trad but choose not to but lets not carried away here
the boys who cant,it wouldnt take them long to learn and
get to a reasonable speed its hardly plumbing or being a
electrician.
skill wise whatever method you use lets be honest
difficult it isnt.
thats why i do it, little effort small investment and good return