Anyone know anything about disc brakes?

Hang on, what's the point of 4 pots anyway? You're just applying the same force over double the area

In the idealised implementation, you're apply the force over the same area (same size master cylinder, twice as many caliper pistons each with half the area). The advantage is that the pad area is concentrated towards the outer rim of the rotor, so although all the forces are the same, the torque is slightly amplified as the mean radius of action is increased.

If you have power-assist, you can apply the same force over an extended area, and if you can't increase the rotor diameter due to packaging issues, that's a good way to get a big increase in brake power. Neither applies to bicycles.

The current Shimano 4-pots use differential pistons, with the leading piston being smaller. This means there's less force on the leading half of the pad, which is said to benefit modulation and eliminate chatter (noise)

A minor benefit is that the radial depth of the rotor track is reduced, so the rotors can be slightly lighter. This is particularly evident with composite rotors, since you're cutting steel and adding aluminium, but even applies to monolithic steel rotors.

The main benefit on a bicycle is that 4-pots just look cooler

Hang on, what's the point of 4 pots anyway?

It allows a larger, longer pad to be used while still having the load from the pistons spread evenly over the pad. It's a pretty marginal benefit, but there is some.