After watching content on 16:9 screens, TV's and monitors, and going to an ultrawide, there is no contest.
Especially, as you mentioned, when watched in the dark.
For some people, there's no going back, now that there are very reasonably priced alternatives.
Also, for video editing, audio editing, and multiple windows. Such as comparing 2 scaled versions of video, frame by frame, there is no contest.
If you are only viewing content, then it is probably not as good a reason to get one.
Team Negative1