Just a question.

Most people raise and lower string height to suit their playing style. Some people like their strings high off of the fretboard, others with their strings close to the fretboard.

 

Let me ask you a question:

How can you control the distance between the fretboard and the strings?

 

Shellac - changing the string height is to alter the distance between the strings and the fretboard, not the pickups, generally.

The higher the strings, the harder to push down, but the less buzzing/clacking etc. you get. So, depending on your playing style, you'll want to adjust the height of the strings in order that they give you the sound you want.

If you play lightly, for example, you may well find lower action is preferable, as it makes the strings easier to hold down.

But if you've got a more aggressive style, you might prefer higher action so that you can avoid buzzing etc.

And if you're playing fretless there's the issue of mwah, to which the action makes a difference (lower action brings out the mwah).

 

No problem