If you watched on your Macbook then you likely watched an SDR stream, which was then boosted up in brightness to whatever your screen brightness was set to. People who watched via their TV/streaming device and got a Dolby Vision feed can't really boost the brightness in that way, since Dolby Vision is already utilizing the whole dynamic range capabilities of the display. So if something is graded very dark, it will show up very dark unless you raise the black level on the TV and give yourself washed out blacks. This may make dark scenes more visible, but will just make normal scenes look like crap.
Compounding this issue further, people with OLEDs may get hit even harder, as extended dark sequences, or sequences that have a consistent overall brightness without fluctuations between shots, may erroneously trigger the OLED screen protection feature known as ASBL (automatic static brightness limiter).
HDTVTest has a good video on this issue. This is intended to detect when the TV is left on a static scene and dim the brightness, to mitigate burn in/image retention. A very dark scene will fool the algorithm into thinking it is more or less static, which will trigger the ASBL and dim the screen even further, making a very dark scene borderline illegible. And because it is a gradual dimming over time, it can sometimes be difficult to even be aware it is happening until the screen is already damn near pitch black.
You can restore normal brightness by changing the relative brightness on the screen by pulling up a menu or backing out of the show, but that can be a pain to manage. And if the TV owner isn't even aware this is a thing that can happen, then they won't know to watch for it, let alone how to mitigate it. It will just seem that dark scenes are sometimes impossible to actually see.
Luckily, on some brands of TV you can turn this feature off by accessing the service menu, but that can be risky because clicking the wrong thing can mess up your TV, and it may void your warranty, not to mention increase risk of burn in.
