Hmm let's see
PS1: Memory issues
PS2: EE, memcard
PS3: Cell, memory
PS4: HDD
PS5 probably have least bottlenecks so far so I think they probably happy with that. Also it BC with last gen without having to add another past hardware
Also imagine if PS5 model use 4nm to shrink chip to <200mm square and achive 300 US dollars cost.
For PS5 Pro, fuck it. 24GB GDDR6X, 54 CUs Navi 41 running at 2.8Ghz because why not. With 4nm they could shrink it down to 300 mm square. Zen 4 CPU to eliminate bottleneck and price it at 500-600 US dollars cost.