I am wondering why "A, or rather B" is used in writing in sentences like the following:
It is well known, or rather notorious, that Tokyo is the Great Babylon of Japan.
Some people might cross out "or rather notorious" for the sake of brevity. We know brevity is important in writing. But sometimes it is not the only concern, and it can be overridden by other factors.
I have seen "A, or rather B,..." in written material. Why was it used in the first place, if not for some special effect?
It would be understandable to use it in speech, since people often make slips of the tongue. But why is it used in writing? I am curious what the rhetorical effect might be.