The sequential read speeds are the same speeds regular SATA SSD's are also talked about. Regular SATA SSD's also fall considerably behind their sequential read speeds in random read and write speeds.It is amazing how everybody starts salvating when a benchmark post high sequential speeds.
If you're going to complain about the PCIe SSD's Apple is putting into their machines at least actually use them in the benchmarks you use as evidence to your claims...To say they pale in comparison is just laughable.
The point of PCIe SSD's is that the SATA3-port literally doesn't support anything faster than about 560MB/s, something current day SSD's achieve in both sequential write and read (in the case of the Mac Pro's 1TB one it's more than twice that) while PCI leaves a LOT of space for improvement. Simply put: SATA3 is a bottleneck and it's fairly obvious that as time goes on there's going to be faster PCIe SSD's coming out that will probably surpass that limit even in random reads and writes.
Contrary to what the general public thinks, the PCIe SSD's Apple is selling are user replaceable.