I’m not aware of anything RW6 can do that RW7 can not. Usually, software evolves according to new demands from users and new emerging technologies – both computer-related and web-related. In the world of software nothing stays the same for a long time.
To get the most from our software, one must keep updating and learning new tricks.
I don’t do this but if you provide a little more specifics around this, I imagine someone could help you out. The backup feature alone is one good reason to forge ahead with RW 7, in my opinion (beyond High Sierra compatibility, of course)
I attached a screenshot of RW6 which allows you to change font size, make letters bold, italic and underline. If RW7 can allow this, then I will be happy…
How wide is your screen? If it’s not wide enough, then the formatting area collapses to only show Style and Alignment. If you make the RW window wider or close the inspector panel, you should see the full formatting features as seen in the move screenshot.