The idea that CPUs don't matter comes from PCs, where CPUs are already pretty strong if you have anything main line series from the last few years.
This isn't the case with Jaguar. We're in for a large CPU boost to consoles next gen. GPU is only all that matters once you've gotten into the modern i5s which are mostly overkill for current 60fps games, but the Jaguar cores we have are way weaker. Think ~900 per core on GB4 vs 4500+. We already see where CPU limits are hit on modern console games that dip below 30.
https://www.eurogamer.net/articles/...e-game-changer-for-next-gen-console-in-theory
"Ubisoft doubled down on its world-building, packing revolutionary France with NPCs, ramping up detail on the city itself dramatically. And as we soon discovered, the consoles simply couldn't keep up - even after multiple patches, only PS4 Pro's boost mode could brute-force the game to anything like its intended 30fps target. Not surprisingly, Ubisoft pivoted away from world simulation as a focus in Assassin's Creed Syndicate - and while we've only had limited exposure to Origins, the sense is of a title emphasising graphics over world complexity, a much better fit for the current-gen machines. "
There's us already hitting world simulation limits on current console CPUs. The fact that current games run on them doesn't mean they can't build out more expansive games on better CPUs either.
Doesn't matter. GPU is all that matters for those consoles.
With the push to 4k most of the gains will cancelled out on GPU level just because of this. AMD tflops even the newest vega 64 14 tflops is barely able to keep up with a 8 tflop 1080 in most games that i saw. The ~12 tflop rumor from what i heard isn't going to impress much already.
If they move to better performing cpu's above 30 fps threshold, they will also have to up the GPU performance to not cancel out it's gains on visual department or it will negatively effect the image quality by having to free up more performance. Which makes no sense for them.
Therefore the only thing they have to do is get a ryzen CPU ( there are trash ryzen cpu's that perform on 2ghz even worse then q6600 from over a decade ago, so yea ryzen label isn't meaning much) that isn't limiting the GPU on 30 fps and eats the least possible resources to free up as much possible resources for the GPU. Basically high enough cores.
What PC does or doesn't do doesn't really matter. With PC focus on more arcade type of games and higher framerates there isn't much need for them to go all out to keep up. As most PC games will run perfectly fine anyway on those consoles. And with the focus on 4k and not 1080p/1440p CPU's will matter even less.
About AC Unity, the game was heavily limited by its GPU also on the PS4. There is a reason that game runs at 900p.
What if that GPU was so powerful, why not just reduce the complexity in AC Unity to get a stable 30 fps and push 1440p? or 1080p with hefty amounts of AA. Because the GPU wasn't capable of doing much more just look at PC benchmarks for PS4 gpu, it's pretty obvious the whole box was maxed out to oblivion and there "super pc architecture, ram PR slogans wasn't convincing the game to run at any decent level"
With Sony's profile of pushing limited CPU tasks in there game worlds GoW/Horizon/UC4 where everything relays on GPU and limited spaces. This isn't going to change.
Also for competition, if sony would go for a faster ryzen but worse gpu, everybody and there mom on the internet will scream that resolution is lower and visual quality on PS5 for its entire generation much like what happened with PS3 and Xbox one.
It makes zero sense for them to go the CPU route specially in current console world.
GPU is all they need, they need every little bit of tflop they can get there hands on and sacrifice as much of the CPU as possible to gain it with there push for 4k.
Then all they have to do next gen is PR wise:
1) 7nm Ryzen
2) Core counts, if not impressive just 7 nm Ryzen
3) Tflops, if not impressive 7nm next gen vega architecture and show a crappy ray trace demo.
4) some ram metric that sounds impressive, like GDDR6 or HBM2, if nothing is impressive just skip entirely.
Everybody will talk for days on how insane this box is and going to perform. However it's just a PS4 2.0.
Easy.