There was so much of the Colonial revival "Duncan Phyfe/Sheraton" furniture made in the 1940s and 50s that it still floods the market, thus lowering its value.
Too bad, because like you say, this is "real" furniture, made of solid wood (often mahogany) with dovetail drawer construction. Now it's lost value to the point that it's barely worth messing with.
I wonder what will happen when the "retro" 1960s-70s bubble bursts, and that furniture is seen for the discardable, souless, mass-produced stuff that it (generally) is. Maybe the Phyfe/Sheraton revival pieces will get back some of their value, since they are in fact very well made pieces.