Drupal 8 already allows Quick Edit for editing fields inline. In the example below, I am about to inline-edit a Body field:
This opens up a simple text editor without the typical editor toolbar:
If you then click on any part of the text, it will show the editor toolbar:
The new in-place configuration options help eliminate the need to dive into the backend admin pages – most of the time. This is a great new feature and one that I think most Drupal users will end up taking for granted as “just part of the Drupal experience” down the road. And that’s a good thing.