Agreed, and it's right there in the docs that one should/could just copy+paste these aliases into their project, read the CSS, and understand how it's working.

Agreed, and it's right there in the docs that one should/could just copy+paste these aliases into their project, read the CSS, and understand how it's working. It's important to know how flexbox works, so you can write your own media queries that will help you align and distribute your objects as screen size changes.