When using spaces you can write this paragraph ending with two spaces in BOTH of the lines
hello
===
foo
bar
---
With the new backslash for hard breaking lines you can’t do that:
hello
===
foo\
bar\
---
Ok, the last backslash in bar isn’t necessary, but he isn’t optional.
The cmark will show de last line as it is. I think this should be optional.
(like this statement: if (true == true) { return false; }, some people argue that you should put braces, because of their style or because you may introduce some new lines)