User blog:JoshuaJSlone/Unnecessary category use?

I'm not calling out any particular people with this, as it's something I've done before too when trying to make pages fit the established mold. BUT something that increasingly bugs me is the use of unnecessary multiple levels of categories. Like check any single from 2008 and you can count on it having both Category:2008 Singles and Category:2008 Releases. Check a DVD from 2008 and it will have Category:2008 DVDs and Category:2008 Releases. Wouldn't the simpler and normal thing to do be to have pages only get the category most specific to them? Then 2008 Releases would only contain the subcategories like 2008 DVDs, 2008 Singles, 2008 Photobooks, etc. Or am I missing something?

Related but slightly different, does it make sense for Category:2008 Concerts to be a subcategory of Category:2008 Releases? Not every concert is released to the public, but those that are will have another category like 2008 DVDs or 2008 Blu-rays or whatever anyway, so they'll still end up attached to 2008 Releases.