The evocative part is at the top, followed by the mechanics. One can complain that the magic missile fluff is poor, but it is there.everywhere? Compare the 4e spell description to a 5e one. I picked this one at random from this thread
it absolutely does not, it has zero flavor, all it does is say what the spell does from
a technical perspective. It is absolutely sterile.
I am fine with adding a line that specifies something like ‘Range 150 feet, Radius 20 feet, 8d6 damage, Dex save halves’ before the text, but not as a replacement for it (if you have such a line, you can make that text more concise however)