All this faster SAS/SATA is fine...
...but what if you need block-level sharing to more than 2 machines from the same storage device?
Try to compare apples to apples for once, a bus does a different job a city car, you can play ones figures off against the others all day but it's still a poor comparison.
That said I'll accept that given every other part of the V-series is 8Gbps they should be connecting them to those boxes at that speed but the older T and F series are 4Gbps throughout.