I mean, I totally get your side, but DVD is 1/24 the resolution of 4K and actual 4K with HDR on an OLED is simply another dimension of immersion for me.
As with all compressed media, resolution takes a backseat to quality of mastering / compression.
I've yet to see a poorly mastered Blu-Ray, and only watched a couple Blu-Ray 4k discs, but online streams at 1080p or 4k are sometimes rather bitstarved so...
With DVDs, some, perhaps many look just fine on a larger screen, but there are some whose mastering is very poor, and those will look really bad on a larger screen. My copy of Forest Gump features closeups where the characters face translates around on their head. But most of the other DVDs I've watched are fine. Yes, Blu-Ray would be better, but not so much that its worth rebuying.
I myself saw "Road House" on Thursday, 4K stream. A lot of dark scenes, perfect for OLED. But also very vulnerable to bitrate related quality problems. And it was fine.
But other examples, like the first season of "Reacher", look like shit in 4K. Many artifacts resulting in skintones that get pushed into green or red. Super weird.
Good encoding comes a long way, and not all services go the extra mile.
Dark scenes don't have higher bitrate requirements than brighter scenes. The problem with dark scenes in movies is simply that video encoders have been tuned based on shit perceptual models that don't match how humans see things. If anything, something encoded for a constant bitrate will have less problems with dark scenes than something targeting an overall file size but with the encoder given leeway to assign bits to different parts of the movie.
