It's Not Complicated
I find that folks tend to assume that artistic decisions are logical and make sense. That it all fits together like a theory of everything in Physics. But sometimes choices are merely practical, like with this image. You see, my camera messed up the white balance of this scene (or perhaps I pressed the wrong button by mistake) and the lovely golden hour light I experienced was neither lovely nor golden in the photograph I captured. I liked the complicated and busy composition, so I went ahead and converted the image to black and white. Simple as that.