What does a ps4 D pad disc bring?

I have often seen that people who modify their ps4 controller put a disc on the D pad or control pad, but what exactly does that bring? The function remains the same and the buttons are also not easier to reach, so is that just visual or is there a reason for it?

Is more accurate, better gaming experience

You can press a point between the right and bottom, for example, so you don't have to touch both buttons individually.

I once tried scuf controller, I didn't really like it now.

Some want to raise the grotty control of a controller to the maximum grottiness, if at all

You can slide the buttons better with your thumb. But it is not necessary.

So you can toggle with the directional pad by sliding your thumb over it. And e.g. Diagonally left up or diagonally right down etc. This can also be made easier.