It's not just economics. Its consuner behavior. Many purchases don't understand the ramificantions of technology, nor do they need/want to.
Compare
"It plays Netflix and youtube in 4k, but not games, but sort of because it upscales, but neo does nativelly but not exactly either because it also upscales but its less, and smart temporal reconstruction..."
Versus: "with slim you get 1080p. With pro you get 4k. PERIOD."
Confusion is one kind of thing that can make many people think twice before a purchase, or put it off for later. When a layman walks into the store, money in hand, you wanna have a product line that is as straightfoward and easy to describe/diferentiate as possible.