I am no authority on DLSS I have to say, though there are plenty of self proclaimed experts on here!
What I will say is the point of that tech is to help bail out the cards that would otherwise struggle. So yes (use it - its free performance; although to directly push the GPU harder I can see your point so try it without first!). I have a 3090 so in some situations the fps is high enough to not warrant DLSS but I understand its uses and always nice to be able to toggle it on. If I had a high framerate monitor I would probably be inclined to use it more.