We've been discussing a change to how we use the classification. Eventually, we are going to be able to classify each track individually. Once that is in place, it makes sense for the album classifications to be determined by the composition of the track classifications, at least in part. The end result of this is that it doesn't look like it makes sense to exempt OP/EDs from a vocal classification. The discussion is still ongoing, but this looks like how the result will go.
Also, note that there are 2 places on the album page to change this classification -- one is for the album, and one is for each media. This would explain why your edit didn't show up.
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