Why? It's not like there is a shortage of space in, erm, space, is there?
There is plenty of room in the ocean, too.
The point is that the more wasted space you have, the harder it is to make something tough and maneuverable. Hence the reason the USS Defiant was so small.
It makes sense that a floating cruise ship like the Enterprise-D had such huge hallways. It even had daycare, which was part of the plot.
However, military/scientific vessels in the years before where everyone on board was working, and not a spouse or child, should have been focused on the mission and designed as such. Hallways should only be as wide as needed.
Now, in defense of ST:TNG, even the Enterprise-D frequently highlighted the purely functional and cramped nature of the Jefferies Tubes: https://en.wikipedia.org/wiki/...