Nicco here. I didn't use a shallow depth of field here for either reason. I wanted it because all of those scenes are memories of years ago compared to the main events. Thus, I wanted to give the feeling of details blurring out as memories fade. By contrast, I shot the main events at ~f8 on the Helios, so the background is quite sharp.
Not only do many see it as a sign of quality, it lets you ignore the set and stage more than ever. Imperfections? Anomalies? Bah they're blurred out of recognition. Of course it can be used still mindfully and tastefully however such nuance is ever more rare.
Most of my cameras both digital and film alike are medium format. While I'm more of a photographer than someone who does much with video it pains me to have to remind people regularly, just because I can get insanely shallow DoF with the creamiest bokeh they've seen doesn't mean it always makes sense to. Theres a story to be told with foregrounds and backgrounds, and how they can be used to guide the viewer.
It's not necessarily a sign of "quality", but it is something we see less often, which makes it more interesting. Phone cameras can't do shallow depth of field, for example.
And of course, the human eye also has a limited DoF range. It is interesting to see things in a way that we cannot directly perceive.
White bread did this, as did purple dye, and synthetic materials.
The exterior shots I've got more mixed feelings about. I think these shallow lenses work best when you have a very controlled backdrop that can be deliberately staged. Using it in a wide outdoor shot feels like a real risk unless you're doing some Kubrickian blocking to make sure everyone is arranged just-so. Or you're making them stand stock-still.