Even descriptive dictionaries imply a certain amount of prescription, as: "prefer using words as they are herein defined, if you care about others being able to understand you".
I would tend to agree. I've heard the "dictionaries only record usage" argument before, and I've always found it unconvincing. The same people who argue for purely descriptive linguistics when you challenge a word usage of theirs for being ambiguous will turn around and correct you when you misspeak.
