My former business partner used to say, "You can't make a quarterback out of a tight end." This was his way of saying that it's bad business to take an individual who doesn't have what it takes for a certain position or responsibility and thrust them into that position. Both the business and the employee will feel incredibly frustrated.
The same mistake often takes place in the church. Sometimes people are added to the ministry staff because they needed a job or have been loyal and supportive to the pastor or the church. But is that an appropriate reason for hiring a person for a specific task? Probably not, especially if that person isn't suited for that role.
I appreciated what Carl George and Warren Bird wrote in their book, "How To Break Growth Barriers:" One of the keys of effective leadership is to work from your area of strength, not weakness. As Peter Drucker...has said, "the purpose of organization is to make weakness irrelevant. To maximize what you do best, you need to be effective in empowering others."