Here are some explanations for Cerny:
"So when I talked about the dream of an
SSD part of the reason for that 5GB/s target was to eliminate loads, but also part of the reason for that target was streaming as in what if the
SSD is so fast that as the player is turning around. It's possible to load textures for everything behind the player in that split second."
"On
PlayStation 5 though the
SSD is very close to being like more RAM."
"This is one of the reasons that 16GB of GDDR6 for
playstation 5 the presence of the
SSD reduces the need for a massive intergenerational increase in size."