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
It’s not just the oled screen though. Dave2d did a review and they updated almost everything. The buttons are improved, there’s a bigger battery, a bigger fan, the ram is faster, the screen is slightly larger and has a 90hz refresh rate vs the og 60hz… not saying it’s a necessary upgrade, but it’s more than just oled