It's not a mechanical logic. Or they would aim for a lower resolution. People are acting like Pro models are underutilized. But they're not.
If Red Dead Redemption 2 was made with PS4 Pro as a baseline it'd look the same. Unless they aimed for 1080p and not a higher resolution like they do.
You want a good exemple of that ? The Last of Us and Uncharted 4. The Last of Us runs at 60fps on PS4. 1800p and 60fps on Pro. Uncharted 4 though ? 30fps. 1440p and 30fps on Pro. To reach a higher graphical fidelity, compromise on framerates and resolution were made.
But those games on PS4 Pro and Xbox One X even with a weaker baseline are already pushing those hardware. If you had to make more complexe games with those hardware as a baseline, you'd have more complexe games... But running at a lower resolution and framerate.
You are still not getting do you? Many won't because they don't have live examples of games being made with midgen consoels not possible on cbase ones.
Let me explain in this from the cooking world. Let's take for example some basic low level ingredients (in this acse game with a concept and scope limited to base PS4 hardware). At last minute I provide you wiith better seasoning, better spices and better cooking tools better oven etc.. (in this case PS4 Pro as a back up plan) and I ask you to improve on what you have, you will cook the same dish but with better flavour and taste and in the right level of cooking thansk to the extra stuff I gave you but it will be always the same dish since you are stuck with the same low scale ingredients.
In anotehr scenario I provide with high quality noble ingredients (in this case let you conceive a game from scratch on PS4 Pro) then leave you the choice to use any spice you want, you will cook a high quality dish from start since you already have the adequate ingredients.
This is the same with going from current gen to next-gen. The problem is that on next-gen, devs are allowed to fashion a game tailored for the next-gen hadrware but not allowed to do so with mid-gen consoles eventhough both mid-gen consoles are respectively 2.3x and 4.6 more pwoerful than their base counterparts which is nothing to underestimate.
Still if you don't get any picture yet, becasue no game is only developed with mid-gen hadrware only in mind and something that base console can't run, then i give you a real example that is no way possible to run on base consoles which is The Book Of Th Dead demo that many even said at that time would be even so much for a late next-gen title, yet devs could run it on PS4 Pro. Now try to run this demo on PS4, if you don't mind?
Of course could develop a whole game running with those graphics on PS4 Pro only (or XB O X only) but due to console manufacturers' policies they aren't allowed to to neglect base console and only develop for mid-gen. I agree that to develop a higher fidelity graphic game needs to have lower resolution on those midgen consoles but running in 1080p or little higher (doesn't need to be Native 4K to be perfetc for this gen) but still a higher fidelity graphic game or a game with bigger scope or with much more richer vision is still better.
That is why, the only loophole and escape they have is to do what they weren't allowed to do for midgen by developing on next-gen since they are allowed to do so.
I think GhostTrick & Plastics-Man are kind of making the same point and don't see it?
eg designing games intending them to run at 1080 on base consoles vs designing games 1080 solely intended for Pro/1X.
haha we are arguing for nothing then. :p