Not sure if it is good or not... but isn't the bus still the limiter?
Yes, it sure is, data transfer rate wise anyway. It actualy becomes difficult to distinguish between stray microwave and digital TV transmissions, and the signal from on the bus at the speeds they're currently running. They have a couple of ways of increasing the speed a bit more but you want to keep the length very very short or your computer starts to act like a microwave antenna.
The thing that's really an eyeopener with the Intel Optane 900p though, is the endurance. It's a very fast drive, currently THE fastest, though the speed is not worth the price in my opinion (because tomorrow, or next week, or month someone will do something faster)
But if you've ever experienced SSD endurance failures, you'll see the benefit to this number. I have had this happen twice, and it's a PITA. Anything not backed up when it happens, is gone to the great bit bucket in the sky.
The closest competitor is the Samsung, at 400TBW before the drive is toast. Intel's technology though is supposed to be capable of over 22 times that. 8760 TBW ("Terra Bytes Written") .
That's waaay overkill for 99% of us today. But not everyone. It took me 3 1/2 years of almost full time use in an enterprise development environment to do the 225TBW (total) that it took to ruin 2 SSD's. It might take me a little less time now, faster processors etc now but that's a hellishly lot of data.