I actually use a 55 B7 at my desk for a couple hours every night for gaming or watching movies/videos. OLED for web browsing or Excel probably isn't the best idea due to burn in. That being said in over a year of daily use I see no signs of burn in, though I don't let anything sit on screen for long periods of time (hide task bar and switch wallpaper ever 2 or 5 mins). In terms of gaming, however, it's pretty hard to beat. That is unless your after very high frame rates and even then it supports 1080p/120 (which doesn't look as bad as it sounds on 55 inches). The HDR in games that support it looks simply amazing. Sure some monitors and TV's get brighter but nothing looks quite as good as OLED yet. That's the main reason my X34 is now my secondary monitor.
No doubt they use tons of power and can heat a room, but my computer can pull about 1100 watts at full tilt so, It's a moot point for me. As for the color you can always tone down blues, but I don't recall seeing and option for a blue light filter. I'd have to check tonight if it does.
Hope that answers some questions about OLED as a monitor. Definitely do-able, and not once have I looked back to using the X34.
Edit: They do have an Eye Comfort Mode, which is basically a very warm color mode.