Bind-mounting the whole wp-content is useful (for plugins, themes, medias, ...), especially if sharing it or testing purpose.
Bind-mounting read-only has its own use (readonly version of the website, development, debugging, ...)
Sadly the current call to tar also extract wp-content/plugins/akismet and wp-content/themes/twenty*which are, AFAICT, the only upstream directories inside wp-content.
These breaks if wp-content is bind-mounted readonly.
Could we think about a way to optionally omit extraction of wp-content? (environment?)