If the performance of these cards justified the price increase, Nvidia would be showing of all the performance number's you could ever want. The fact that there is no performance information tells you everything you need to know about these cards.
But they never release number's they just say is X faster then this card from the previous gen, which they have done just with ray tracing so until there are some real benchmarks I wont worry, if they come out and show bad performance then I will ;0