Taking notes of who called could be part of your day.
That would be useless if that person needs a call that day.
He gets the info instantly, without disrupting his admin's work to take my call, or interrupting whatever he's up to because I called. He's taking texts all day long anyway because that's how his guys keep in touch with him as well, so boom, no muss no fuss, instant update.
And it takes nothing away from our evenings together.