And of course you also think that Paul wrote the book of Revelations in his spare time? After he was dead of course.
What are you talking about?
Paul told Timothy "All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: That the man of God may be perfect, throughly furnished unto all good works. - 2 Timothy 3:16-17
1. If the man of God can be made perfect and furnished to every good work from the scriptures revealed 1,800 years before Joseph Smith, why did Joseph Smith need anything else? Answer - He didn't. He tried to add to what God has revealed. For that, he will be accursed.