I made this exact mistake when the Switch OLED came out. I got caught up in hype, I bought the new one, and slowly it dawned on me that I just spent 300 extra dollars for exactly the same machine I already had, and a screen that, as good as it was, was NOT worth that 300 dollars.
If you don’t own a Steam deck, then go nuts! Do what you want.
If you already own a Steam Deck, you already own everything you actually wanted a Steam deck for. An OLED screen is not going to make the games you already play somehow magically better. You’re fine. Chill out
“Need” is the wrong word to use in this sub. The Deck is, at the end of the day, a toy. No one needs it.
That said, from day 1 the only thing I’ve ever wanted to be different about the Deck is the screen. I want a steam Deck that has a screen as nice as my TV and my phone. Worth is relative and depends on your means. For me the upgrade is worth it, for others it’s not. Both of these things are fine. You’re valid for not wanting to upgrade.