> When you say something is minimal, you are implying that what little you provide will also work.

No you do not. You just saying it’s got very little code and/or very few features.

Support for older browsers might not be one of those features. Which means this minimal frameworks isn’t suited for the kind of projects where that kind of compatibility is a concern.

If you look outside of CSS (and particularly web development as a whole) you’ll find a plethora of minimal frameworks that intentionally make compatibility trade offs.

> Which in this case is clearly [does not work].

That’s a gross exaggeration and you know it.