Another theory was that it's a shot across the bow of the dem's collective intention to keep being obstructionist. The current remit allows Trump to officially collate a huge amount of wrongs/abuses of process committed by his opponents, and wave threat of prosecution in their faces (separate to the more serious sealed indictment stuff - that's clearly going to be a bloodbath). Essentially giving him free reign to continue with his MAGA agenda without spooking the normies.