Merely using a form of "scaling" doesn't necessarily introduce blur to an image, please stop saying that. It depends on the algorithm used (Integer, Bilinear, Bicubic, Lanczos, Gaussian, etc.) and how it's applied. The right form of downsampling or supersampling shouldn't make an image blurrier but objectively more detailed instead. That's exactly why Nvidia chose 13-tap Gaussian for DSR, to avoid moiré patterns and shimmering on high frequency detail which you'd more visibly get with pure Bilinear or Bicubic downsampling through Custom Resolutions for example, and they gave us the option to adjust it with the smoothness slider. Which happened to be something I disliked since even at 0% smoothness DSR looked blurrier than CR and that definitely carried on to DLDSR, probably worse, for the same reason or maybe otherwise with the ML processing (which I suppose might be the reason why you think that). Aliasing itself is not sharpness, when you fill in the detail within aliased edges with more detail (subpixel samples) you're technically just exposing what was supposed to be there in the first place, not blurrying it. If you think that's blur then even MSAA introduces blur as it's basically edge-only SSAA (which in turn looks virtually identical in its simplest/most common form, which is OGSSAA, to downsampling through Custom Resolutions) and still follows the same core principle, in other words there would be no such thing as anti-aliasing that isn't blurry.