"Gimmick: an ingenious or novel device, scheme, or stratagem, especially one designed to attract attention or increase appeal."
HD Graphics is essentially that, theres a reason 900p vs 1080p was a point of contention in the console warz at the beginning of this generation, its exactly why 4k is being pushed so hard as a selling point for PS4Pro and Scorpio. They're using Increased Resolution to attract attention and increase appeal for their systems. Hence HD Graphics are a gimmick.
Switch dock mode resolution bump confirmed for gimmick.