I've understand the main purpose for using a motor shield (powering motors without frying your Arduino) but I've also seen a few videos recently about using MOSFETS and pwm to power different motors. Why bother with a motor shield, libraries, etc. if simpler components can do the same thing? What does the motor shield offer that simpler components driven by any Arduino cannot accomplish?
I've been considering the Adafruit motor shield 2.3. I was discussing with a friend that wasn't savvy with Arduino when she asked me why even bother with the shield. I couldn't give a decent answer since I don't have enough electronic/programming experience. I've basically been getting by how-to's on Youtube and this forum.