If you don't use html tags, the contents of DESCRIPTION field for added cards (a new Bad Guy, etc.) turns into one messy chunk. No paragraphs (no matter how many empty lines in-between paragraphs one creates), no list items. Just one big messy chunk.

But the PROBLEM is that there is no visual hint in SuperBetter interface that makes it obvious that HTML actually works in your editor, that it IS possible to format text properly (<p>for paragraphs</p> and stuff like <ul><li>item 1</li><li>item 2</li></ul> for lists)