Things like CSS grids should remain behind the curtain. No one really needs to know how it works, or why. Until you have a broken design or something complex and you can’t figure out why your spacing, margins, paddings etc are all messed up. It can be a real pain, especially when you are generating content dynamically in some sort of interface that changes and shifts.
Quelle: The Subtle Magic Behind Why the Bootstrap 3 Grid Works | Experience Design at Hello Erik