I have never seen the Eagles as having everyday, intimate personal contact to people, so they wouldn't a) know and wouldn't b) tell all the details of the lives of their bondes friends. I have always seen the contacts they had as something special. Remember Gwaenur was at first reluctant agree to a role as carrier, even though it was an emergency. I feel the same would still hold more true for any services as messengers - they lend themselves to it only under really, really, important circumstances (remember the often asked question why the Eagles didn't simply drop the One Ring into Mount Doom - Manwë Air Express *g*).

Anyway, my point is, in effect, that I see it as you said above.