fraggle said:
This demonstrates the fact that those prepositions mean absolutely nothing.
It demonstrates the opposite - the fact that our need for what our meager stock of prepositions does has encouraged the drafting of words from other parts of speech and the creation (or borrowing, actually) of new linguistic constructions that half-ass the job demonstrates their value and importance to meaning.
This assertion of the meaninglessness of prepositions you keep repeating on this forum has been debunked at least three times now - debunked using your supposed examples, and your supposed illustrations, and your confused arguments, each time. It's an interesting passing thought, whim, or whatever, but it simply isn't so. Time to give it up.
btw: Cable-ready often means with cable installed and cable service available (not: ready for cable) , user-friendly means easy to use rather than friendly to users, sugar-free means without sugar rather than free of sugar (think heroin-free / free of heroin), and so forth.
There can be a subtle difference in the meaning of "over". "There are clouds over all the region," implies "above" but, "There is coal all over the region," doesn't
The one refers to a continuous or unitary something, a mass or area or spread or extent (the region entire); the other refers to discontinuous or fragmented or numbered or otherwise separable distributions (here and there in distinct places one might find anywhere in the region).
There is grass over all this region / There is grass all over this region / there are grasses over all this region / there are grasses all over this region.
Continuous/massed vs fragmented/numerous.
That is not a subtle shade of meaning, but a basic and fundamental distinction of perception and thought well established in English generally and often by the preposition in particular - one of the strengths of English as a language.