Global margins/paddings lacks control

Why can’t we have the global settings target only margin-bottom?

For example, I’d like all rows to automatically be 20px margin button, instead of 20px on all edges.
Seems like a pretty straight forward thing to implement?

Each row, column and module have the ability to set custom margin/padding, would just love it in the global settings too. Right now, for me, the global setting is useless since I might not want to add more margin/padding to left and right.