Buttoning and fluting solve the same problem in opposite ways. Both exist to hold padding in place across a large surface, but buttoning does it at points and fluting does it in lines, and the two catch light completely differently - one in scattered highlights, the other in long continuous bands. Using both on one bed is a deliberate contrast, not an inconsistency.
Fluting is the older of the two in furniture terms, borrowed directly from the fluted column, where vertical channels were cut into stone to make a heavy cylinder look lighter and taller. Upholsterers took the same trick: a channelled footboard reads as slimmer than a flat one of identical size.
The judgement our master Indian artisans make on a bed like this is about how little carving to use. With upholstery covering most of the surface, carving becomes an outline, and an outline works by being thin and continuous. Every scroll here is cut to a consistent width so the line never thickens or breaks - which sounds simple and is the hardest thing in the piece.