It's curious, vivid seems to be a more accurate colour profile for classic Doom and Doom 64, the reds in particular give it away where in classic Doom having it in standard causes the reds in the HUD to be particularly muted from how'd they'd look on typical CRTs. Doom 64's HUD is additionally far more visible under vivid, where standard causes it to almost completely blend out, which does not match how it looked on an actual N64.
I almost wonder if vivid mode is actually normal for the OLED, and standard is a tweaked profile to match the Switch LCD from before. And maybe that matches some developers intention to look how it does on some basic LCD, but certainly not for anything made for a CRT, let alone anything I've worked on.