This is ... confusing. a) The concept of a typographic grid is a print layout design tool fundamentally unsuitable for coding flexible component-based layouts

This is ... confusing. a) The concept of a typographic grid is a print layout design tool fundamentally unsuitable for coding flexible component-based layouts on today's web (it probably always was, but talking about a "grid" can give designers an air of technical mystique they quite enjoy ;) b) Flexbox was invented to move beyond the grid. We don't want or need a grid anymore. c) It takes less than 1 day's effort to learn the vanilla CSS flexbox API and you can re-create this "grid" if you really need it with a few lines of plain CSS. No framework dependencies, other developers don't have to learn the framework, and no polluting your markup with global utility classes.