To create the highest quality content, the writer must specialize in that exact industry. This is paramount in highly specialized arenas like the law. Hiring just any writer to create material for a law firm is a recipe for mediocrity. If what matters is quality, then the writers who are best positioned to provide that quality are those who have laser-like focus on the law itself--and have the experience to back it up.
The folks over at Moz recently touched on this in their weekly Whiteboard Friday post. The point is essentially to emphasize the need to prioritize quality--even more so than is done now. It is a familiar refrain, but we all could use the healthy reminder. If you've got a few minutes before the Memorial Day holiday weekend, take a look and read the whole thing.