For WordPress projects it would be useful to have a template with all possible output from WYSWIG editor, because this is a part which we often miss while developing WP projects (especially if someone is new to WP).
This is already almost done in ITCSS PR - there are default styles for basic elements plus there is styling for common post classes for aligning images. I think what only misses is some styling for blockquote.
For WordPress projects it would be useful to have a template with all possible output from WYSWIG editor, because this is a part which we often miss while developing WP projects (especially if someone is new to WP).