Discuss the need for a tag.
First used: 2015 year, post #2023065.
Second used: 2020 year, post #4171533.
Used by user: @Marqant - first post, @ljhkhjkghjybtvhyt - all other post.
Is the tag redundant and subject to removal? Will other users be using it?
https://danbooru.donmai.us/forum_posts?search%5Bbody_matches%5D=noise+reduction&redirect=false
As we can see, there is no active use of this phrase by other users at the present time.