Maybe it should be, but it’s not actually a thing of the past. I would bet hard cash that a higher number of recently released expensive monitors ($1000+) don’t have retina than those that did. There is still a massive market for people willing to make the trade off in another direction (like higher refresh rate or going ultrawide) rather than retina.
Obviously it’d be amazing if what you said is true, because both retina and HRR are very nice to have