Strange when industry veteran tell that XSS is a potential bottleneck, their opinion is somehow dismissed ("b...b...but they have yet to find out how the magical RAM saving features....").
Yet, this guy now "proves" how the SSD is not necessary, by giving his assumptions and with no real proof.
Anyway, that guy should also point out in his video, what the comprimises would be to port the game to last gen(s). It's not like the RAM amount, for example, is the same. Lower assets quality, longer loading times (maybe even midgame...), sub-30 fps, smaller environments, less effects.. etc.
Ah but wait, if he starts to list such compromises, people would start to argue that, indeed, the game is benefitting from an SSD....