It's just a quick key reminder - you can always do things the old way and click with a mouse...
They only have a certain amount of screen real estate - I for one am happier with the content taking precedence when the page loads and the hints left to the bottom where I can scroll to them if I need them.
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
Yes, comments are tied to specific versions in order to allow members to post comments while author's fine tune their article during the composition and approval process.
An example is that you post a new article and it's in a Pending state while members approve it. A few members find fault with it, and you make those corrections, and then the article is approved. The comments related to corrections should not be included in the final published version of the article.