Upload & Sell: Off
I don't know, I find that as long as we don't think of focal lengths in terms of angles of view, but in mm, then the FF equivalent makes sense, for getting an idea how much you will see with a given lens. And for those who want to compare depth of field, the equivalence also makes sense, as long as it is carefully noted what is equivalent.
What I don't like is that as soon as someone suggests a lens to someone, for example the OIympus 45mm f/1.8, then someone else comes along and says "well, that is a 90mm f/3.6 equivalent", which it isn't exactly, only for angle of view and depth of field purposes, but for light purposes, i.e. exposure, it is a 90mm f/1.8 equivalent. This subtlety is often swept under the rug by those whose agenda is to knock lenses with more depth of field.