Additive meter is actually a well-known concept even in Western music. It's clearly needed even to make sense of, e.g. "5/4" or "7/4" meter, which yes, are sometimes found in the repertoire - because these are already ambiguous in practice: does the 5 in "5/4" mean "3+2" or "2+3"? You need to know that in order to understand the music and figure out how it goes - to make it "meaningful" as someone else said.