> 28GB/s under conditions that will never be met for more than a few seconds at a time given most enterprise workloads
640KB ought to be enough for everyone!
The Jevons Paradox, proposed by economist William Stanley Jevons in 1865, states that technological improvements increasing resource efficiency often raise total consumption rather than lowering it.
In 1999, when I was looking for an apartment, a large complex had a big banner on their office, advertising a T-1 line (~ 1.5Mbps), shared between all tenants. That was a dream and I thought who would need more than that and why.
There are use cases you and I cannot think of today for 28GB/s. But, just wait a few years for PCIe to become commonplace and you will scoff at PCIe 5.0 speeds.