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Whiz... I don't necessarily disagree with you... However, as an admin, I can tell you that over the past 10+ years many e-mails about updates have either never been read or the reply is simply, Huh? I think most of us are at least a little geeky so I would like to know what is happening, but maybe their experience has been the same and they have chosen to let the changes be noticed instead of saying "look what we have done!"
I don't really know... could be darn near any reason. I am with you though... a little communication would be a wonderful thing.