Sure, if you think it would be more authentic looking. It would be lower polygon count too. The pilaster panels will  have to stay relatively narrow like they are now.
It isn't really like drawing (I can't draw at all); it's placing points, lines and faces in 3D space to form the shapes. The more points (vertexs), the smoother the curved lines and faces can be made; but each vertex must connected by lines to other vertexs to make four-sided polygons (quads). More polys = better detail. More polys = longer render times & more memory needed.

Friends don't let friends use booleans.