The creation of special account is to avoid of having negative feedback since it will only be used for such purpose since the main issue here is the account/s of having negative trusts/tag because mods even admins can be tagged, like who knows they are not inevitable from that.
Let's say one of the forum staff creates an account for that specific purpose and at some point in time he gets tagged for something (on his main account). Since this new account is connected with his main one, it will automatically get tagged as well. Therefore, creating new account just for that makes no sense to me and its unnecessary complication.
In the end, you can't 100% prevent an account getting negative feedback due way trust system works.
But I also don't think that's very fair to other respectable members.
I say this because some of us can create a very well-developed topic about an important subject for the whole community, and the moderators conclude that it should be a sticky topic.
If only that special account creates these topics, other good topics created by other users will no longer be marked and forgotten.