If they are the Faithful and Discreet Slave, and they have been anointed to speak for Jehovah himself, they are the ones who should be doing the writing; not the helpers. The helpers, for the the most part, are not anointed. How would they know what information Jehovah may want to convey to be the truth?
Agreed, they supposedly have a hotline to God so they should be writing down His thoughts as he dictates to them. Over and over again we try and point this out to lurkers that the GB are claiming to be the spokesmen of God so everything they say should be accurate and unchanging.
If they are the channel then they alone know God's thoughts. On the other hand if they are just a publishing and real estate corporation then anyone can write the articles as long as they keep to the party line.