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Sumo
Ok, I'll bite. A few reasons off the top of my head:
You're all talking about road pressures here. A really fast tub (pista evo cl) is still faster than a clincher and can be safely run at very high pressure 200psi +, making the rolling resistance significantly lower. Hardly any of the tests use these high pressures because only track riders use them and no-one cares about track. These tests are done and published to sell new wheels and tyre systems to mamils/triathletes.
Before we get into whether you need really high pressure or not - think about what it's like to ride a tyre with less than 100psi in it at high cadence on the rollers. Horrible. It's also worth noting you're more likely to get a perfectly round tub than a clincher, which makes a huge difference at high pressure. You feel every little lump and bump.
Tubs handle much better if you puncture them than a clincher - you can safely ride a deflated tub for long enough to slow down and get off the track. Same cannot be said of a clincher.
I'm sure that if there were any benefit to riding clinches you'd see GB/Holland/france etc using them.