In the AEM editor, Horizontal Line Block, please add the capability to change the line color to something other than black. And add the capability to control the thickness. And how about the capability to shorten the line, and change the line styles. Essentially all the things you can do with a border, apply those to the Horizontal Line.
Current workaround is to insert a text block with a line of Underscores. You can color that, but can't control the line thickness.