I think it is preference. There are, however, some songs that tell a story and if you remove a verse, it's like leaving out chapters 4-6 of a book. I know churches all over the US do it frequently now, but I remember growing up in the 70s and the Lutheran churches I attended did it regularly. So, it is not a 21 Century happening, but a happening that has been happening for at least 40 years. And I'd bet it has been happening for 100 years in the US in all kinds of protestant churches.