In order to facilitate the latter mandate all Airlines to require their pilots log a particular number of manual flying hours per year.
As there is no way you can have an audit trail for manual flying during line flying then it opens the way for wide spread cheating. That is a common thing in fake logging of instrument flight time on line - no audit trail. As far as simulator logging of hand flying is concerned that means the sim instructor must keep the log which gets messy. And don't forget it is a good bet that many sim instructors are themselves addicted to automation.