something doesn't add up and I also would like to know what the problem is...
I mean adding a slow Sata SSD to the PS4 cut the loading time roundabout in half in most cases.
If you look at the PS5 loading times, it is only 2-3 times faster then a PS4 with HDD, so it would not be that much faster then a PS4 with SSD, despite a way faster SSD, way faster decompression block, way faster CPU, way faster RAM.
And I don't buy the "games have to be optimised for the SSD" argument, the loading should still be way faster then it is now.
I am quite puzzled at the moment. Maybe it is something that will be fixed with new firmware?