30% that is multiplicative with other boosts is bordering on a generational performance increase.
That 30% is only for the checkerboarding effect, not the whole frame. We've discussed this before.
https://forum.beyond3d.com/posts/1995906/
Yet they still sell cards as fast as they make them.
Yeah, when the cards are mere thousands world wide, FuryX had the same crazy "demand exceeded supply" claim, and guess how that turned out.
http://wccftech.com/amd-hbm-ramp-expected-shortages-fury-fury/
FPS figures that may change daily don't make much sense.
Nor do assertions of ridiculous gains out of thin air.
Hard to tell their thinking, but probably has to do with performance in a synthetic benchmark being somewhat easy to nail down. None of those pesky resource management issues, variable object counts, complex shapes, etc messing things up.
So your argument basically boils down to lots of ifs, maybes, perhapses, guesses and postulations, yet you tell about it like the second coming.
NVidia's D3D12 still seems to be broken. How long has that been now?
It runs most DX12 in a solid way, most games that struggle are AMD evolved titles or have broken path on both vendors. Besides, you don't see people here claim NV will gain 30% more performance once they optimized their DX12 drivers. And if they did they wouldn't be left unchecked to claim whatever baseless point they conjure.
Though that doesn't provide an answer for why D3D12 is generally regarded as inferior on NVidia.
D3D12 is generally unstable and undesirable right now, many games work worse in DX12 than DX11: Battlefield 1, Deus Ex, Quantum Break, and Warhammer. Comparing previous gen (Maxwell vs Fjij) NV cards run many DX12 games faster than AMD: Forza 6, Forza Horizon 3, Halo Wars 2, and Rise of Tomb Raider, Warhammer, Gears Of War Ultimate. and Gears Of War 4. But AMD runs others faster: Sniper Elite 4, Hitman, Ashes of Singularity, The Division, Deus Ex, and Battlefield 1. We have an
entire thread dedicated to tracking down DX12 games, full of links to all sorts of tests, you are welcome to check it out.
To sum it up: The situation is a mess in D3D12, though it's a tie at worst, It gets even more messier if you involve Pascal vs Vega, as some games that were slower becomes faster, or vice versa. The jury is still out on this one.