The point of a library or framework is that I don't need to tack one on. I could spend time writing my own grid system that uses CSS Grid and only supports the latest browsers (without a polyfill) or just use Bootstrap 3 or 4's grid, which has been tested already, supports lots of browsers and requires no effort.
I know this bills itself as a "reset" but when you look at the buttons, text utilities, spacing utilities etc it's far beyond that. In many cases it's just re-using Bootstrap's naming conventions and code. As far as I can tell there's nothing like Bootstrap's theme customization tool for it, so I'd have to do it all by hand.
That link recommends for a grid system, it just advocates capital 'G' Grid instead of other solutions. There's an entire section where they encourage a framework for working with Grid. I have never worked on a site that doesn't need any concept of a grid.
I know this bills itself as a "reset" but when you look at the buttons, text utilities, spacing utilities etc it's far beyond that. In many cases it's just re-using Bootstrap's naming conventions and code. As far as I can tell there's nothing like Bootstrap's theme customization tool for it, so I'd have to do it all by hand.