I mean if you need something faster than 6gb/s your just going to pay extremely cutting edge tax. A 1tb pci-e 4 nvme drive hitting 5gb/s is $250 itself
It's pretty amazing how fast ssd sony was able to put into console considering all that, isn't it? Respect to sony for ssd awesomeness. Not an easy thing to do. Console lifecycle is long, eventually ssd's will become cheaper.