Electric guitar pickups are based on a magnet with a coil of wires wrapped around it. Think about the invisible field around a magnet where it "grabs" ferrous metal nearby.
The vibration of the strings inside that field is transformed to electrical signal by the coil of wire wrapped around the magnet.
Now... the field will be strongest at some certain spot... and adjusting your pickups up or down finds that spot. Just past that point and just before it sounds very different to an experienced ear... and everyone has their own opinion about which is the "sweet" spot.
I personally adjust my pickups to their strongest position and adjust the amp from there.
Bridges on "lesser" guitars often suffer from a sharp edge where the bridge meets the string, or a limited travel distance for adjustment in intonation and string height. Generally more advanced bridges are found on more expensive guitars or as aftermarket products.
Most folks never have a real need for them, but "
Roller Saddles" are very nice, reducing string breakage and increasing tuning stability.
Remember, wherever you go... there you are.