The installation of a high-quality MosFet is a very useful tuning measure, especially if the installation is doing by an experienced person or dealer.
The advantages are obvious: The installation of a MosFet reduces the resistance and the battery runs longer. The SwitchUnit is spared. Gear jams are a thing of the past.
The voltage increases, ie the motor rotates faster (= higher RoF) The response (triggering) is accelerated. With many MosFets different shot modes can be programmed and set.