Regarding bugzilla:49603 I think those, with exception of draft namespace, should only be shown when the user clicks an extra button (i.e. 'enter draft mode'). Doing otherwise is confusing -- I'm reading "foo bar" and click edit; suddenly a "foo (!) bar" where the (!) opens a comment. This is likely to confuse people I believe (and certainly gets in my way where I'm not editing a draft in the draft namespace -- where the comments are a helpful means to collaborate).
BTW, in draft mode, these comments should be more readily visible. See: http://core0.staticworld.net/images/article/2013/08/libreoffice-1-100049022-orig.png