Like I said, agree to disagree, diff'rent strokes for diff'rent folks and all that, but to me, after a day, the most pertinent at-a-glance information there is "this was received yesterday". I definitely think it's more useful for more recent things that can say "37 minutes ago" or "3 hours ago", but to me, "yesterday" is also useful. (I might prefer it if it said "yesterday morning" and "yesterday evening" or something like that, but I rarely care about the exact time, after a day.)