I don't buy this "indistinguishable" claim. Especially in any general case. At most it would be not too annoying. It's always about paying with one quality for another.
Arguably native rendering wouldn't have antialiasing, because that would be downscaling, so DLSS would have both some disadvantages and some advantages. So the best case is better than "not too annoying", it has the potential to beat pure native rendering.
> Arguably native rendering wouldn't have antialiasing, because that would be downscaling
If you're unfamiliar with computer graphics it's unhelpful to try to nitpick and just end up being incorrect. Antialiasing is not downscaling, and less data is never going to beat more data for visual fidelity.
I said 'arguably' for a reason, not out of ignorance. Parts of the pipeline are still per-pixel, and parts are effectively rendering at a higher resolution.
> less data is never going to beat more data for visual fidelity
It has less data but better processing. That can look better sometimes.
Except it doesn't strictly have less data. It has multiple frames and other information to work with.