I have been trying to understand the function of padding on fields and other objects like buttons. I understand making items bigger for use on Go but frequently find that on both Go and Pro that an item doesn't look right. Text isn't centered or a button icon is flattened and it doesn't look right if I increase the point size for the icon. Setting the padding to 0 on all 4 settings and it looks fine.
Typical padding for a text field in Pro is Left and Right 6, Top 3, and bottom 2. Same field for Go is Left and Right 12, Top 14, and Bottom 10.
I have found it useful specific instances when I want something displayed off set in one direction.