A
YKTTW containing this message is a sign that the creator isn't entirely sure whether their proposed idea is actually a trope or not. They're probably worried about it being
too generic and meaningless, or perhaps
Too Rare To Trope. If the thing you're looking at isn't very trope-y, you may want to help them out by suggesting a change.
See also
Not A Trope.
Compare and contrast
Should We Have This.
