Yep, pretty much. But therein lies the problem: filtering out garbage writing is something done by humans, whose limited time, attention, and effort all make for a pretty tight bottleneck in the first place. Degrade that channel capacity, and our ability to find texts of value becomes pretty close to nil.

edit: Also, when the noise comes in the form of competing signals rather than random noise, that becomes much, much more difficult, but we're also outside my area of expertise at this point.