That may be part of it, but that "MacBook" look is not particularly bad either. Now as to how much it should have evolved over time vs how much it actually has... that's a different story.
I don't disagree. Certainly the 90s look of black matte plastic with separate hinges and huge bezels around the display looks cheap and low-quality and if I'm honest it's one of the reasons I don't own a System76 machine.