I have noticed this practice occurring at a couple of churches. I think what really bugged me the most, as I watched this practice, was the fact that Ministers of Holy Communion were doing it and that I know was a no-no.
When the pastor decided to put a end to it at my parish, there was a great uproar. I think that part of it was due to the fact that he did not explain the reason behind it. At least that is my guess, since parishioners who were upset could not give me the reason why other than: Fr. XYZ said we could not do it.
Fr. Z has a simple explanation of why this practice should be stopped and a huge number of people asking questions and posing comments.
As always, kudos to Fr. Z.