By far the most important thing about the PS5 SSD was the fact that it wasn't optional, and developers would no longer have to care about being able to run off mechanical drives. That has repercussions throughout the broader gaming industry because the game consoles are the lowest common denominator for game developers to target, and getting both Xbox and PlayStation to use SSDs was critical. From the perspective of PlayStation customers and developers, the introduction of the PS5 was the right time to talk about the benefits of SSDs generally.
Everything else about the PS5 SSD and storage subsystem was mere icing on the cake and/or snake oil.