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Hmmm, I still feel the same about this "No Walk On" but oddly enough, I have 2 no walk on's to do in a 7 day period. One is a flat tile roof and it has so many cracked tiles on it now, I just know I'm gonna crack 50 more myself, so it's a no walk on and there's a small flat lanai roof behind the pool cage.
The other is one of those metal shingle roofs with the granules baked on. I don't care to test it out and it's an easy from a step ladder job. 2 parts by the pool cage will require we take a 4-5 steps up, so we can shoot it out from there.
As you said, I just don't like the scare tactic of competitors who advertise "No Walk On" and try to scare customers into thinking roofs shouldn't be walked on. That's nonsense!