More VRAM is always good for 1% lows in some situations (which is what matters to me, anyway for the most part), so I don't see what's surprising in that regard.
Keep in mind, two of these tests are 1440p, and one is at 4k. Still fair enough though.. at least the 1440p tests I guess.
Next generation will probably show for a matter of fact that 8GB wont be enough @ max 1080p anymore for 60 fps, especially with RT now getting a foot in the door for its relevancy w/ Indy. And it checks off what I personally believe.. "next few years".
Now of course, this is fine, just drop some settings and you'll be okay. But its certainly a sign of the upcoming future. Lets hope we arent getting 8GB cards for mainstream cards by then (still wouldnt mind 8GB of VRAM for xx50 or equivalent cards.)
As for DOA status (atleast among us hobbyists, consumers will eat this shit up as per usual, not really worth getting mad about), regardless of what NVIDIA thought, it was gonna be DOA to us regardless because of its meh performance uplift. Once again, another example of this generations seemingly continually repeated addage of "40 series + ~10% performance". 5090 remains the only really nice looking performance bump, and the 5070Ti the only other compelling product because MSRP pricing that is fake anyway.