Without jumping on Georges toes. I see Jeet not adding ‘any additional markup’ in light of something like Bootstrap or Zurb (both extremely popular frameworks (both of which George mentions at the top of the article)) and Harry Roberts’ CSS Wizardry Grids that force you to include the grid within the markup. With the idea being you then put the actual HTML you’re wanting to use within it.
I haven’t, personally, seen many grid systems that allow you to use fractions as well as decimals (and a combination of both) which, I feel, makes Jeet stand out a little more.
Obviously there’s nothing stopping you or your team from doing what you feel necessary for your work be it modify someone elses work to suit or deciding to write something from scratch.
It’d be great if you could share your solution so everyone can benefit. I love looking and learning from how other people use Sass in their projects.