A natural wood frame is the harder finish to carry off on upholstered furniture, for a reason that has nothing to do with taste: it hides nothing. Paint fills small gaps, evens out grain and disguises a joint that is not quite closed. Polish reveals all three.
So on a sofa like this the joinery has to be right before the finish is even considered - every mitre closed, every mortise tight, every carved band meeting its neighbour cleanly at the corners. Workshops that paint their frames can be forgiving about that. Workshops that polish them cannot.
Our master Indian artisans treat it as the honest version of the work. The carving is cut deeper than it would be for a painted piece, because shadow is doing all of the work; the timber is selected for consistent colour across the visible rails; and nothing is filled. What you see is what was made, which is the point.