I would consider the approach in this posting to be rude. I feel like they are shoving a bunch of information at me without context. Part of the purpose of the salutation is to allow the call receiver to orient themselves. “Who is calling?” “How urgent is this?” “Do I have time to talk now?”
The thing with a messaging "hello" is it doesn't provide much of that information. You're only able to evaluate the time commitment and urgency by having the content of the request - a "Hello" ping on instant messenger is an attention stealer but it prevents the reader from being able to triage. It commits them to paying attention and waiting for at least part of a conversation that they may or may not have time for.
doug_durham · · focus · HN ↗
SketchySeaBeast · · focus · HN ↗