If native has artifacting then there is something inherently wrong with how it's programmed. Thus, DLSS "looking better" than native is only a way of saying that a game is programmed with the arse.
All real-time rendering has artifacts because everything is under-sampled on top of all of the limitations of various rendering techniques, lod scaling etc. When you switch from "native" rendering to DLSS you trade one set of artifacts for another.
Edit: All anti-aliasing solutions like FXAA, SMAA, TAA etc introduce artifacts in the form of blur and the loss of high frequency or high contrast detail, which can then be improved with sharpening which introduces its own artifacts like ringing etc. If you turn AA off you'll get aliasing because you're no longer hiding how under-sampled the image is. You trade artifacts for subjective trade offs in image quality. DLSS is no different, except it comes with a significant performance boost.
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