Understandable -- if I could ask, then, what might be something that is (or has been) gamechanging? Are gamechangers known to be such upon arrival? (That's a r

Understandable -- if I could ask, then, what might be something that is (or has been) gamechanging? Are gamechangers known to be such upon arrival? (That's a real question -- I might argue they aren't known immediately. )