Oh, I don’t know so much about that, I kinda like Chris Tomlin’s chorus addition to “amazing grace”.
But if you are adding/deleting major doctrinal points, that is another story.
First thing I do when I go to a new church, is check out the hymnal. It is usually the best gauge of beliefs/emphasis.
However, the worship team finds stuff from who knows where and gives me a Xerox copy that they'll be using.
I have messed up many times by not fully checking what they give me VS what the program has.
(But I have to plead guilty to changing archaic words/spelling at times myself.)