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You're buying an enterprise grade HMD with a higher resolution and higher requirements than our consumer HMD, and attempting to run it off an entry level gaming laptop designed for casual gamers and Fortnight players. That laptop is okayish for gen 1 HMDs; not great but okay. It's simply not suitable for higher resolution HMDs and you'll need to adjust your expectations of what that laptop's capable of. "there is no good reason to my mind" does not translate well into technology which has firm requirements which are clearly listed. '
Well when people who work in enterprise are as amateurish as you, it's no use the pot trying to call the kettle black, to my mind anyway. I have hacked around to make the Vive Pro work on the Dell G3 reasonably coherently. It would work perfectly if your organisation could be bothered to design your products properly, but you do not and then you blame the customer.
I can run engineering simulations, data science pipelines on the Dell G3 no problem. It's a great laptop, especially after modding with an SSD and extra RAM. Perfectly suitable for 'Enterprise Grade' applications in other areas, just not yours. Clearly this is my fault, even when it meets the spec sheet 100%.
I, as a very well informed consumer, have every right to believe that when your specs specify Displayport 1.2, a SUBSET of T3, a T3 should be more than adequate. You as a technical professional specalising this kit should know what SUPERSET means in terms of cabling, in terms of the engineering reality. The Displayport signal carries straight through a T3 cable the same as a DisplayPort one does, no hardware, firmware, up-or-down conversion necessary. You're the Silicon Valley pro, I'm just some guy who lives in Wales.