Ever received a voicemail or text message that says nothing other than “call me”? You got a “naked ping” – a context-free request for response / attention / action.
The naked ping should be Considered Harmful, for at least two reasons. The first is that it conveys no information. The recipient of your ping, like you, is a Busy Person. They may be in the middle of something requiring intricate thought, and should not be interrupted for anything less than fire, flood, or six figures of revenue. Worse, you may forget why you pinged someone; when, four hours later, your victim gets back to IRC and responds to you, you will be disrupted in turn trying to remember what was on your mind in the first place.