the reason should be an architectural difference that can't do the needed calculation fast enough or yet another driver bug.
NGU and polaris release time is very similar and it was very fast known that polaris doesn't perform well if i'm not mistaken i was one of the first if not the first to notice and investigate on this.
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Yeah but thats steam, those figures are going to be massively skewed toward gamers, you cant call that "the market share", Most HTPC owners could own AMD cards, we just dont know.
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not only was it hard to even get your hands on an polaris card when they where released the mining boom killed that product totally for the gaming market. if you now add the well known NGU problem it's not very great idea to get one if you want to use NGU.
fermi was decimate by GCN 1.0 for nnedi3 too this got better with kepler and was fixed with maxwell where AMD didn't even compete anymore and just refreshed old cards over and over.
and even then AMD was still faster and AMD had a bug where it lost about 50 % performance while decimating nvidia.
the 7850 and the r9 270 classics.
good old times. the fix not getting an nvidia card if you wanted nnedi3.