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Imagine seeing this and not wanting to get a ps5
Graphically I think it is significantly better than the 2018 Spiderman, and it is possible that the Miles Morales PS4 version will not show something close to this level of graphic detail.
This statement makes me think that we will see interesting graphical improvements in PS5 cross-gen first-party games, in addition to the inclusion of Ray Tracing and higher resolution.
One hypothesis for this is due to the fact that the PS4 and PS5 SDKs are similar, making it easier for a game developed for PS5 to be rescheduled for PS4 pipeline. But of course, for that to happen, the PS5 version could not demand much of I/O and CPU, which are more difficult to scale components. But this first wave of next-gen games seems to me to be more GPU bound, which is just the easiest component to scale, especially in the beginning of generation where resources are still being used gradually. What we are seeing from SSDs is only faster static loadings, in which the PS5's brute i/o force is able to accelerate without the engine having to perform so many specific optimizations.
When the second wave of next-gen games arrives, the engines will probably be completely rewritten and I think we will see more CPU bound games, more use of the I/O architecture streaming SSD/RAM, and consequently the PS4 will no longer be able to follow.
In cross-gen third-party games, I think it's a tremendous headache. A Call of Duty Black Ops: Cold War handles at least 8 SKUs: Xbox One, Xbox One X, Xbox Series S, Xbox Series X, PS4, PS4 Pro, PS5 and PC. How to work with so many specific optimizations for each SKU? They will probably be basic optimizations, as we have seen in so many cross-gen games. In a game like Spiderman: Miles Morales, there are 3 SKUs, all with similar SDKs: PS4, PS4 Pro and PS5. In this case it is much easier to seek to extract better capacities from each platform, and to expect cross-gen games that give us a better sample of what the new generation of GPUs of these consoles can offer.
Finally, it seems to me more that the cross-gen issue is due more to the fact that the first wave would not be able to take advantage of all the features of the new generation. And even a Demon's Souls: Remake built from scratch for the PS5 could perhaps be ported to the PS4 without so much difficulty due to the similarity of the SDKs, and the game being primarily GPU bound.