These specifications don't mean anything for a lot of people. To me they sound like marketing buzzwords that companies use to try to sell me inferior products. I'd much rather have them say 2k than any of the "FHD" abbreviations.
If anything 2K and 4K and 1440p are the more marketing terms because their ambiguity allows companies to apply them to products in a misleading way to market their product as something better than it is.
Also, annoyingly enough, QHD itself can stand for "Quad HD" or "Quarter HD", the old smartphone standard of 960x540, which admittedly has pretty much entirely fallen out of use