From my experience I can tell that most of the clients prefer this kind of presentation. It has some unique feeling of handcraft which is a great value in the era of VR, and also make me feel less guilty that I'm not drawing as much as used to anymore
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No matter how hard you will try with (pseudo)fotorealism it will always lack 'human factor' and it has nothing to do with the radiosity/GI/caustics/HDRI etc. Don't know how about you, but 3/4 investors usually don't care how soft the shadows are or how realistic glass looks like, what they need is legible concept in no time, and for that this combination suits perfectly.
Why do we need 18 sketch styles when half of them are useless? I would trade them for photoshop basic function like transparency + ability to render it together with LW (I'm not dreaming about full implementation of LW for now). This way I would cut my workflow by half.