Cropping is nothing new and not the devils work... Here are a few negatives by
Paul Almasy, who was something like a Salgado of the Fifties:
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As you see, he wasn't scared of drastic cropping, and if the photographers of yesteryear weren't then why should we. What is often overseen in cropping advice is that a cropped image needs to be blown up to a viewable size, i.e. the smaller image resulting after cropping will not have the same quality and resolution of the original. In the webgallery world, if you have an original of 900*600 and crop it to let's say 750*400, you have to reset the size to have a presentable size (unless a thumbnail is big enough :)). The resolution and resulting quality loss remains even if you crop the original file. Maybe there is a smart way to bypass this, I don't know.
Less of a problem for full-frame images than for photos taken with a cropped sensor (because it has more details, so the quality loss is not so bad - but still noticable).