I see it. I completely missed it, I guess it sort of blended into the other checkboxed options.
@reosarevok - to address your question directly, as time is passing the data is becoming less and less useful. As my digital collection continues to grow, the need for digital specific metadata becomes more useful.
At the present time, let’s say I have an iTunes release. MB provides me with no different than just looking at the Apple store. I understand MB seems to be stuck on using barcodes, catalog numbers and labels, meaning the imprint, but personally I see no use for this information at all when cataloging and organizing my music. While I can see how having that data as supplemental is good to have, the more useful attributes are simply ignored.
I am not upset or quitting, I just no longer see benefits to the efforts of most things, at least now. This applies only to digital, I believe the data is premium in quality when it comes to physical media. Sure there are some items I think could be added, but overall the data is typically solid and accurate.
I still add some releases here and there, but it takes a good amount of time to even get them entered with acceptable quality of data. All the data is in my metadata, but I can only import names and titles. Attributes like ISRC, explicit mark, etc all exist in the data, but need to be entered manually. Not just manually, but you need to go in after adding the release and do it individually on each recording. Regardless I still add some as the benefit of MB is not to serve me, but to serve all with accurate data. So I try to add things that are unrepresented in MB, like a new artist for example. I try to add the artist with good attributes and at least one release.