[colept]

It looks neat but I'm left wondering what sets this one apart from the many others in what seems like a flavor of the week.

It's minimal indeed, but almost too minimal. In my experience working with CSS frameworks, the "there's a class for that" pattern is almost always not enough and it's much easier to write rules to handle customization. That leaves out both developers that aren't designers and designers that develop.

Applications aside, the semantics of some of the content is not up to date (for example <section> vs <div class="section">).

[zoria]

The semantics are reasonably outdated, but I wonder if part of this is due to certain things like using <section> might affect content placement and/or nesting (section classes are used only for cards so what if a card is inside a <section>?).