I haven't noticed this at all. Can you post a picture showing said pixelation that's a result of the screen resolution?
If you already have a Deck another $549 is too much for OLED and a better battery. If I drop money like that I'd want a SoC at least as good as the 7840U and a landscape oriented screen with VRR. I respect your opinion if you find it to be worth that kind of money. Admittedly, I have cold feet about selling a Deck out of warranty, as when I sold my launch 512GB the APU failed on the kid just a couple weeks after he bought it from me. I'm not the type of person who would tell somebody to just eat it when you're talking over $600. Luckily it was still under warranty. Since that event and considering my current Deck is out of warranty, I wouldn't consider selling it.
If you're going to sell, do it quickly. Market value for a used Deck is already at the $279 baseline with a 1yr warranty. Without a warranty, value would be around $200-225 imo. *EDIT* They just sold out of the $279 Deck as I finished typing this.