Wrong, the evidence is that for last gen., we really didn't see any Pro-console exclusive games or features. The base consoles held developers back from shipping games or features that required the enhanced specs. If thats wrong then I look forward to all those PS5 Pro (and whatever hypothetical future Xbox Series X Pro) exclusive games and features that are enabled by the extra processing power and ram. Somehow I doubt we'll see that, though.
no, base consoles did not hold anything back.
there are two critical things that sets a CRITICAL baseline: RAM and CPU.
and guess what? ps4 pro only provided a mere %30-35 increase in CPU frequency. that's it. no way in hell that changes the baseline for game development. as a matter of fact, all it caused some 3rd party studios to target 30 FPS on the faster CPU and let PS4 suffer with sub 30 fps drops more often.
the PS4 pro had the almost exact same memory budget as PS4. so you can literally not design a different baseline game for a PS4 pro. it simply wouldn't even possible.
only xbox one x had more memory over all other consoles but that just was a niche but helped one x to retain native 4k in some games over ps4 pro
there would be no game that wouldn't scale back to base ps4 that is solely designed for ps4 pro. if your game is designed to hit 30 fps on the ps4 pro cpu and designed to fit into the memory buffer of ps4 pro, it will also do so on the base ps4. on cpu fronts, you will simply get drops to 25s on the base console, which is practically what happened with most 3rd party games after 2020
you can design a ps4 pro game that runs at 1080p and ps4 pro can still run it at 540p, even this happened kind of, with the likes of guardians of galaxy, cyberpunk and "avengers" running at atrocious resolutions on ps4. but it happened. even there, you could clearly see devs targeted 1080p/1200p 30 fps on ps4 pro actually.
so nah, not the same situation.
IF PS4 Pro provided a CPU that is 2 times faster than the PS4, then yes, a theoritical game that barely hits 30 FPS on PS4 pro would only hit 15 FPS on the PS4. therefore, to get PS4 running at 30 FPS, the said game would have to be designed around PS4's CPU instead. as a result, PS4 pro would now hit a consistent rock solid 60 FPS.
but neither happened. not with that puny %37 frequency increase from 1.6 ghz to 2.2 ghz. all it did was that devs designed around 30 fps target for 2.2 ghz and ps4 got the short end of the stick. ps4 users got by because 24-27 fps is still somewhat playable in some form.