I'm very glad to see Sarah Gooding promoting the Child Theme mechanism, here on WPTavern. Theming with Child-versions is powerful, yet accessible to folks who cannot yet create a theme, ab initio.

Sarah's style sheet is a perhaps unusual example of a "proper" Child-css, by including only those style elements that depart from the Parent, while everything else inherits. It's relatively short, compact and approachable. (Other Child-css are tweaked copy & paste.)

Lastly, there is no small number of themes in the repository which 'credit' others as being the 'inspiration', or 'based on', when more forthrightly they are Child-examples ... and might have just said so. Acknowledging & publicizing that Child-themes are valid members of the WordPress repository is a valuable service.

Ex Astris is at home in the blog-verse, and the imagery has me checking the backpacking kit. :)