That isn't universally true.
OLED does need to get brighter, though, for HDR.
It doesn't seem to be as big of an issue as it was for plasmas. Burn-in (and temporary IR) were a constant worry with plasmas. For OLED it seems to be rare enough to be chalked down to either panel defects or abuse. But yeah, it's still a concern.
On the other hand (Z9D):
Plus FALD LCD doesn't pass the eye test. I shopped against the Z9D and the KS9800 when I bought my OLED. These FALD LCDs look great on full black screens, as they did when the first FALD displays came out, but OLED cleans their clock overall on dark scenes. The demo loop in Best Buy Magnolia had some challenging scenes with blacks and the Sony/Samsung just couldn't keep up with the OLEDs.
Also, as a "for instance", in last night's Game of Thrones, in the scene in the tomb, my B7 displayed the candles perfectly as bright flames in a sea of perfect black. On a FALD LCD, they would be surrounded by a glow, as the zones/overlap of zones don't line up 100%, and black levels are elevated around those points.
At this point I don't think I can go back to LCD.
I probably wouldn't recommend an OLED to someone who plays only one game that has static HUD elements, like an FPS or fighter. LCD makes more sense for them. Just not high-end LCD. I really like the Vizio P-series or TCL P607 for gamers like this. Great sets, very capable, with local dimming.