It is also not a picture of the one cloudless day in Seattle this summer either. This is a gutter on a building with a very steep roof and very high gutters. These are rather dangerous gutters to maintain clean and free of debris---and probably nothing the average homeowner should attempt to clean.
To give you an idea of just how high these gutters are, here is a picture of the adjacent building I inspected just the roof on (the original inspector didn't have a ladder long enough---and I am still crazy enough to have such a ladder. The ladder is not quite fully extended here---but pretty close.
I think one could make a good case for gutter guards on difficult to maintain gutters like these. I have never seen issues with either Gutter Helmet or LeafGuard type systems---unlike those micro-filter, sponge, or grate type covers that typically clog and allow water to just run right on by and over the gutter. For me if I can walk around a home with these types of systems and not see impact trenches around the home where the water is running over the gutters, I take that to be a sign that they are working as designed. Of course any type of gutter maintenance system can have problems---including falling off ladders and/or roofs while cleaning the dang things.
Every year, thousands of people are injured and some are even killed while cleaning gutters.
Charles Buell, Seattle Home Inspector
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WA State, Home Inspector Advisory Licensing Board