I completely understand what you mean however.. how would a super Fast SSD benefit games like Ori and the Will of the Wisp or a 2D Platformer? Just to name this genre as an example.
So the reason Cerney cited PS1 as the starting point of this issue (aside from working at Sony, but that generation specifically I mean) is because that was essentially when field of view (from first person or third person) started becoming more standard. In side scrolling 2D platformers, your field of view is always constrained to a specific, usually small area.
Such as Ori, or Bloodstained. But even in those cases, they want to allow you to see as much pleasantries in that constrained space as possible, without tanking the framerate too much, or having to remove details, etc.
So in a side scrolling platformer, they can use this technology to for example allow you to move much quicker without making notable artistic sacrifices.
From my observation you can move much quicker in Bloodtained than in Oro.
A tradeoff would be that Ori can and does have much higher fidelity instead.
And if the textures in Ori are so detailed and beautiful that they push the limits of what the system is able to load in, then the faster and bigger the memory, the more beautiful they can make the game.
Which is one reason why even with Xbox Serie's X's SSD, there will be advancements there.
Though Sony are making their SSD so fast and multitask capable (traditional SSD's have two true purposes, while theirs has 6) that it can even function as RAM, which is why this is so fascinating.