That might be a bit too close the the line as mentioned. But if certain GIDs are undesirable on the current list, I see no reason on removing them. But maybe it is cause of the term used, how about instead 'retired' GIDs, which is still just a listing of GIDs and may have been replaced and has been referenced for historical purposes?
I am renaming (retired and semi retired, and removing the mentioning of not working) cause I still think it is a tricky thing. Send me a message if you want to talk further on this :)