I’ve done a number of choir & a cappella concerts and competitions where they seem to feel the need to have everyone mic’d with a handheld.
In fairness, close-mic'ed vocal jazz and vocal
a cappella is often about achieving a particular sound as opposed to a particular volume, and even at the high school level it's been around for a long time (I started working in the genre about 15 years ago, and it was well established back then).
That being said, in my neck of the woods any ensemble with more than about six singers would typically be using
wired mics.
-Russ