I'll take a crack here: they believe the need should be solved elsehow. They see the "I want to send a message later because I don't want to bug anybody" need a

I'll take a crack here: they believe the need should be solved elsehow. They see the "I want to send a message later because I don't want to bug anybody" need as better solved from the other end: "I don't want to be bugged because I'm asleep/busy/whatever".