While I commend you on your excellent response (no, that's not sarcasm), I do believe that etiquette is an artificial construct that is designed purely to stop people from killing each other, and that as civilisation advances it becomes, like religion, superfluous to our survival as a species. I don't think it's obsolete just yet, but I do believe with the increase in virtual meetings and second-generation rich hippies, the frivolities will show an active decrease over the next generation.
Much like captive monkeys[1], we cling to traditions that no longer serve us as a species.
[1] You have five monkeys in a cage. A bunch of bananas is suspended from the ceiling, a ladder underneath it. One hungry monkey approaches the ladder with a clear intent to get a banana. As soon as it touches the ladder, you turn on the hose and douse all the monkeys with very cold water. In a little while, another monkey attempts to get a banana. Again, cold water for everybody. Turn off the water. When a third monkey, nearly faint with hunger, tries to get a banana, the others will grab it and hold it back, because they don’t want another cold shower. Now, remove one monkey from the cage and replace it with a new one. As soon as it sees the bananas, it will try to go for them. The others will viciously attack it. After the third attempt, the rookie will realize that it cannot have a banana. Now, replace another one of the original monkeys with a new one. As soon as it reaches for a banana, it will get attacked by all the others, including the rapidly learning rookie #1, who will be as enthusiastic as the rest of them, if not more so. And so, after you have gradually replaced all the monkeys, the cage will contain five monkeys who have never had a cold shower but who will not allow anyone to get a banana. Why? Because that’s the way things are done around here.