Yes it's very disappointing and has been a bit of a trend recently (Injustice 2, MvC:I and a few others) simply doing 1440p rather than using CB. The Pro can produce fantastic results on a 4K display using CB especially with a dynamic resolution. I remember being blown away by Uncharted 4 at its initial release on base PS4 on a 1080p display but at 1440p on a 4K display IQ certainly takes a big hit.
Perhaps competive games (like fighters where people judge moves by the amount of frames they take etc) may require full frame updates but as a casual I would prefer higher image quality by default with an option to go from 1800/2160c to a lower progressive resolution in the options for competitive people/scenarios.
Yes, I don't know if Naughty Dog set the trend. I still remember in the leaked papers where SONY stipulated they'd rather not have 1440p as a recommended resolution for PRO and they listed some resolutions that would scale better to 4k....However, since ND gave us a simple 1440p patch of UC4 (as good as it looks), I've seen so many devs just stick that to PRO owners as a 4k rez mode...
If these guys can push 1440p, it means they can push 2160CB or 1800CB at worst if they desire. The pro hardware takes care of this and it should be the same of even less pull on the hardware with 1800CB and about on par with 2160CB. That would mean a much crisper image at about the same performance. AKA much better IQ. Why is this not happening..
Even at Pro's launch, there were games with normal 1800p or higher, 4k native and some checkerboard games. Guerilla gave us the CB poster image in HZD, Poliphony gave us 1800CB, Watchdogs 2 looks very crisp as well and so is FF15 at that same rez, but it seems that many have just followed Naughty's implementation of 1440p. I still remember, many including myself were disappointed when Respawn only gave us 1440p on titanfall2, when you had awesome pro implementations like Blops3, Infinte Warfare, Modern Warfare etc.. with their 2160 CB. Then Prey patched up to 1440p, Fallout, Hitman, Dreamfall, Homefront, Hellblade, Firewatch, Here they lie, KOF14, Injustice 2, Mafia 3, Project Cars 2....Hell, even FF12 is 1440p and so many more. Sony has to light a fire under these devs asses. All of these games should be 2160CB and FF12 should be 4k native tbh.....
So many of these pro patches have just not been optimum, the hardware can defintely push more pixels through CB...... PS4 was designed for CB, use it for crying out loud.....