This seems to be a theme lately and it is starting to annoy me. Someone learns that what they are doing does not coincide with etiquette and rather than accepting that, accepting the consequences, and moving on, it seems that many are arguing that it isn't etiquette because they personally are not offended by it and that everyone is different.
The point of etiquette is to not hurt or offend anyone's feelings or to be convenient to you. Yes, everyone is different and everyone has a different background. This is precisely why it is important to follow etiquette. You never really know what all of your family and friend's expectations are so it's better to err on the side of caution by following etiquette.
This is one reason that posters are "hating on the (guestbook attendant) job." Many do view it as a job, not an honor. Although you might view it as an honor, is it worth offending someone by asking them to do what they consider a job?
We all make etiquette breaches. I can list many faux pas I committed during wedding planning. I either didn't know and tried to amend what I did, or I did know and decided to live with the consequences. I didn't try to argue that just because I didn't see the problem that it wasn't etiquette.
My Grandparents on their wedding day.
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Repeat this to your self: My Wedding Party is made of my family and friends and I should treat them as such.