That's a reasonable way of looking at it, but capabilities are not restricted to low-level system properties. Here's a terminal UI system built around three main capabilities:

- layout (adding components to the component tree) - event (handling user input events) - react (reacting to changes in reactive values)

https://github.com/creativescala/terminus/tree/main/ui/share...

This is the case study I'm using for the book chapter.