I would suggest we rename the available formats in the meantime:

"Normal" > "Paragraph"

"Heading 6" > "Subtitle". This works nicely underneath photos as a description or for credits.

"Heading 5" > "Normal"

However, the problem remains — a large membership will not be able to figure this out for themselves.

Playing around in the Quill "Playground" you will see that there is no issue there. 

We really need the feature to be updated.