Man I remember Val trying to convince people not to buy OLEDs because of burn in... Glad I didn't listen.
I had no idea Lost legacy was a remaster, I thought it was odd to play that first, then I came across a reddit post saying how good the graphics are lol.
Try Forbidden West as well, and yep dark games absolutely shine with OLEDs.
Have you tried any TV/movie content yet?
Just so you're aware, that FPS counter in game mode isn't necessarily indictive of your frame rate, but rather what refresh rate your TV is showing. It's a bit hard to find a good explanation for it, but you'll notice the counter will show 119-120 for games you know only run at 60. But then again if you have VRR active with an unlocked game, that might be your frame rate?
To be fair to Val, some of the older OLED did suffer pretty bad with burn-in. LG seemingly got it together with the C9 and every iteration since. And if seemed like when LG figured it out, so did Sony and OLED took off.