[meigetsu]

I generally agree with this, but I also think there is a legitimate use case for saying “Hello”, namely when you have a request that actually needs a fairly imminent response and if the person you are pinging isn’t responding right away, you need to move on to someone else.

If you type the full message to the first person and don’t get an immediate response, as you paste the same message to other people, the first person or few people who didn’t respond immediately might waste their time duplicating work that someone else you reached is already doing.