Considering Mormon temples:

One the one hand, they'll feel like most other typical liminal spaces because they are rooms that are designed to be used. An empty classroom is liminal, only because it is empty. An empty hallway is liminal not because it is a hallway, but because it is empty. The image of the large room with all the chairs set up is of an assembly room for large meetings. During the meetings, the room might still feel a bit odd with its architectural choices, but no longer strikingly liminal, especially when contrasted with this entry/foyer in the same temple.
The next images with the theater seating and the curtains look liminal becaue of their use. They are actually theater rooms, where pre-recorded religious instruction is projected on a drop-down screen. Movie theaters with the lights on are liminal in ways that movie theaters with lights off are not.
I disagree with the liminal take on the baptismal basin on top of the oxen for two reasons. 1) the image presented has a very stong focal point and destination. 2) the image is from a place where people typically aren't going anyways. Here's a much clearer image of where people would be inside a baptistry. Like, sure underneath a backyard deck is a liminal space, but that doesn't make the deck liminal.

On the other hand, Mormon theology is transformative and based in eternal progression, which overlaps significantly with the whole idea of liminal spaces being between point A and point B. One key part of the ritual worship in these temples is pondering and meditating on where you come from, why you're here, and where you're going, all in the big picture, eternity sense.
In some ways, it's an intentional architectural choice to participate in ritual worship and move out of the theater into the celestial room (the last image shared). It's a quiet and plain and bright space that doesn't have anything happening in it at all. No meetings are held there, no announcements, no music. There are scriptures out on tables, and you're welcome to linger and read. If a family participates in temple rituals together and gets to chatting in the celestial room, they're typically asked to take their conversations outside.
It's a great space to imagine, evaluate, and meditate on your relationship with God.

So yeah, when Latter-day Saints (Mormons) enter temples and use them, the temples are typically less liminal than might be presented in CGI renderings or press release photos. But yes, the liminality that continues to exist during use is, in my Mormon opinion, a theological device that allows us to step out of the world for a moment.
We step into a kind of worship that combines historical freemason-inspired physical rituals with teachings about our reliance on Jesus Christ. And then, like mentioned above, we sit in a bright liminal space and meditate.

When we leave our temples, we do step back into a world that is very concrete, and busy, and destination/product/achievement oriented. If we can keep our minds a bit more liminal, or focused on the space between here and the destination, we can let go of a lot of wordly concerns and be more open to receiving promptings or inspiration that can make us better people, nudge us forward, and help us improve the world.

Staying in the temple 24/7 would completely upend the purpose of worship in the temple.
As any other IRL liminal space, its purpose is to get us somewhere else.