So I received my OLED and in comparison to my old LCD model the screen itself is not much better, it’s alright, but it’s not much difference vs LCD, especially for 200 euro more than LCD model. The battery life is a great QOL change, that I would gladly pay ~50 euro to get. Regardless I returned my OLED and I’m staying with LCD till Steam Deck 2.0.

Yup.

Nope. You won’t be able to use next version of DLSS on your 4000 series, so it’s always the best the show how fast is GPU in pure raster to see how much actual power it has.