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I agree, that's exactly the kind of thing that comes to mind when I see those photos. I just thought (based on no knowledge of fancy house selling or photography), that they could make an effort to make it look less like that instead of more. The shed and decking here are 4 years old, but have a bit of colour to them still.
https://www.rightmove.co.uk/property-for-sale/property-85728028.html
Counterpoint - unpainted timber cladding always looks shit after a few years anyway