What I meant to say is that we live at a time where rendering every single pixel all the times is simply a waste of resources - that can be better spent somewhere else.
And you're still saying it's "blurry" - that's not the point. Certainly temporal reprojection will -always- be blurrier than not using it. But you're not considering what you're -gaining- by that blur. The real question is - would it be better to say, have a world with 1 million objects at 4k, a bit blurry, or a perfectly sharp image, at 2k, with 100k objects...
Temporal reprojection saves time that then can be invested in other things.
Lastly. CP2077 ALWAYS uses temporal reprojection. ALWAYS. If you disable DLSS it uses its own TAA instead. If you disable TAA (which cannot be done in the settings menu, but there are hacks to force it) is STILL USES temporal for most of its rendering before the final image.