In my opinion, the author-level metric can distort a real author's citation impact. For example, an author who has an h-index = 2 obtained on the basis of two published papers of which each is cited twenty times is more influential than an author who has an h-index = 3 obtained on the basis of three published papers of which each is cited three times.
Perhaps the most powerful and appealing aspect of another's words, however, is simply their convenience. Whether distilled in the briefest apophthegm, or spread out across some voluminous tome, the thought is ready-made, the heavy lifting done. It's there to be used like a weapon or tool, and as time wanders on, seemingly leaving us fewer and fewer new things to say, it becomes ever more useful. As technology moves forward, as well, it also becomes much easier. Indeed, in this "information age" where so much is available to so many so quickly that enlightenment nearly verges on light pollution, it can sometimes appear that expression has been reduced to nothing more than a mad race to unearth and claim references. As such, the citation is also there to be donned, like some article of fashion from which we may reap the praise of discriminating taste without ever exerting ourself in the actual toil of manufacture.