I could not think of a good way to work on a PR, so creating an issue instead.

This is what REAME says regarding delight and projectile:

;; Remove the mode name for projectile-mode, but show the project name.
(use-package projectile
  :delight '(:eval (concat " " (projectile-project-name))))

However this under certain circumstances would have serious performance issue, an

The README file is a little bit verbose. Ideally, it should just include some basic stuff. Principles could be extracted to the Wiki or to another .md file.

Open to feedback and ideas.