they're clearly skimping on parts This is not clear at all. Every manufacturer uses 6-bit displays, even in most if not all high-end models. This has been true

they're clearly skimping on parts This is not clear at all. Every manufacturer uses 6-bit displays, even in most if not all high-end models. This has been true for years. They choose to do so because such displays have desirable properties other than color, such as price and lower response times.