alt Hacker NewsI know the trend from the LiminalSpace subreddit. It's nice to scroll through, peaceful yet slightly unsettling. But I think a lot of that effect comes less from the physical "in-between-ness" of the spaces and more from the fact that they are places you would expect to have people, but which don't. The article notes this but only in passing. You never see a photo of a busy corridor, for example. They are always empty which is what gives them that uncanny feeling. I went over to that subreddit now and there are even a couple of photos of people's homes, which are surely the opposite of liminal spaces. But they appear not only empty but also anachronistic (with, eg, 70s decor or older wallpaper) which also seems to be a trend with this aesthetic.
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I'd agree that's it a component, but not a necessary one?
One of the strongest senses of liminality I've experienced has been being in a middle school at 9 PM when almost nobody else was in the building. I was a poll worker and we were wrapping up for the evening, so there were only 4 of us there. Doing things like walking to the bathroom through the empty school felt very strange, because I was surrounded by evidence of people using this space and yet there were none there.
A different place I felt that way was when I lived in Flint, MI. I'd walk to work early in the morning, and I'd pass the Flint Institute of Arts, which was at the time one of the few places in the city with any money, so they had a very well maintained and manicured outdoor space (evidence of people), but I never saw anyone.
On the other hand, airports and hotels are classic liminal and they're usually peopled.
Maybe I'm slightly projecting my European sensitivities here, but I think there is more going on there than just the emptiness. There is a common theme that the spaces depicted are, on their own, quite unpleasant (barren, made from flimsy materials, probably emitting some amount of toxic fumes); it's just that this unpleasantness is normally masked by their human use and interpretation, which invariably some form of commercialism and hype. (Hence the abundance of hastily erected American mall architecture.)
A historical European town devoid of people does not work as a liminal space picture at all, because it still looks nice; and neither do the postapocalyptic settings that Japan is so fond of (YKK etc.). Eastern European commieblock and UK Brutalist hellscapes are actually quite similar in terms of the feeling they evoke, and have their own fandoms, but are considered their own genre - so I would conclude that "liminal space porn" is spaces only made tolerable by commercialism with the commercialism taken away, and the related "/r/UrbanHell" material is spaces only made tolerable by human habitation with that taken away or suppressed (e.g. if the humans are so bereft of vitality that they can no longer overcome the space's badness).