User blog comment:MeerkatQueen/List of VOCALOIDs with "br" phonetics/@comment-26967944-20161216045524/@comment-53539-20161221173825

The English Vocaloids should, in theory, need BR's less because a lot of the sounds in English involved little releases of air. This is due to its word blending. In Japanese, the sounds are sharper, so breaths may be less noticable. I won't say there is no use for them though...

Plus breathing in song is traditionally considered "unwanted". Just as "noise" was considered bad at one stage or nasally results unattractive. I'm afraid the western cultures seem to prefer clean results. This... Is not always true now, but has been a curse in the past. :-/