1. Cost. A good SQ unit costs well over 500 dollars, a unit with a ton of features can cost over 1000 dollars. Combine the two and there's no way they'd let it go under 2000.
2. Space. Like I've noticed with my flip-out unit, nearly a third of the size of the unit is devoted to the screen. After removing that much space, there's not much more space left to put things in the unit.