Is a house connection room under the house useful?

Please do not be upset, this question has no practical relevance, I am just interested and I hope there is room for such questions here in the forum.

I have noticed on the side and have been thinking about it since that "in the USA" under the houses there is a smaller empty space (not a basement) in which flexible pipes for water, sewage, etc. "are" and if you want to change the layout of the room in the house above, it is very easy because the pipes under the house are freely accessible and can be routed into any room at will. This seems to me to be somewhat more complicated here in Germany. Do you know why or what disadvantages the construction method described above from the USA has? I saw it on the channel HGTV, which shows many house renovations.

Houses in the USA usually do not have a proper foundation but are built on stilts. Therefore, a space arises between the ground and the floor. Often not even usable as storage space but rather problematic because things tend to nest there. Electricity still comes in from the side. In Germany, the whole thing is probably not feasible structurally and energetically. The type of piping also plays a role... hoses are mostly not allowed... If you want to be flexible with the floor, you have to look at a flexible system floor. We use it, for example, in server rooms. Neither particularly nice nor cheap. And you also lose height. The construction method in the USA is simply different. Most houses consist of a few beams with sheathing. Therefore, easy to change or tear down. A small storm is enough. Here, at most a few tiles would fall off the roof.

How are these flexible pipes protected against frost? Or did you see something on TV about what they do in Georgia, but would never build like that in Wisconsin?

In Canada and Alaska, these stilts are necessary. Look at Dawson City Kissing Building. There you see what happens when you build directly on the ground.

They freeze even inside the house Nothing insulated. You could see that last year with the low temperatures. Over there, double-glazed windows are still promoted as an innovation... The stricter and more extreme our regulations are, the more lax they are over there when it comes to building fabric and energy requirements.

Permafrost soils are special. But the stilts are seen almost everywhere in the USA.