The PS5 SSD read and write speeds are ~5.5GB/s so
I don't understand how you arrive at 3x improvement over the XSX SSD. Another advantage for the PS5 SSD are the 6 priority levels in the controller and from what I've heard in podcasts and read, it seems to enable devs to prioritize what information comes out first(Texture data having a higher priority than audio?). We know normally SSDs have two but how many does the XSX have? But this 3x increase in priority levels doesn't equate to a 3x throughput!!
I've listened a lot to Moor's law is dead and it's a great podcast although sometimes he goes a bit overboard in his estimates(So you have to be aware of that) but he's usually spot on. He got his 3 channel information from Coreteks who is also credible and had it at 3 channels(XSX) to 12 on the PS5. I commented in one of his videos and he referred me to Coreteks channel about the PS5 SSD. But the E19 controller in the XSX is should have 4 not 3 channels. So most of these guys are getting vague information about the XSX. The same would be true for the PS5 if they hadn't publicly revealed information on the SSD controller. But in terms of that, the PS5 SSD is far superior.
Another thing is, it's not in Sony or MSFT's interests to explain all the customizations to their SSD controller for obvious reasons. We're really lucky we got that info from Cerny at this point in time.
But there's another surprising thing; The cost of the SSD in the tentative BOM is high for both despite the PS5 SSD being far superior. It's like MSFT paid a lot of money and did't get a good deal. We know the E19 controller can go up to 3.7GB/s and it's surprising they stuck to 2.4GB/s. Could it be because they wanted to ensure PCs would be able to catch up?? Of course these numbers should be taken with a pinch of salt and we should expect a lower actual cost for the XSX SSD but the gap won't be as high as the throughput difference between the two SSDs.
Actual BOM Cost for XSX SSD should be a bit lower than $150 but $150 sounds realistic for the PS5.