Phillips bits have a blunt tip which allows the screwdriver bit to cam out when a lot of torque is applied. This prevents it from over tightening the screw

Compared to the slotted design, Phillips allows the screwdriver bit to sit more securely in the screw’s drive, allowing for greater torque to be applied

Frequent camming out can cause damage to the screw and the work surface, as well as wear down the screwdriver bit

The Phillips design looks very similar to the frearson and pozidriv design, which often leads to customers purchasing the wrong screwdriver bit for their screw, or vice versa