In informal conversations, it's often useful to write newlines without beginning a new paragraph.
In Markdown, this requires you to use two spaces. There is no good reason for this, and it's extremely annoying - when would you ever want to put a newline in the message but not have it encoded in the HTML?
I propose that a departure from the specification is made so as to emit a newline with each newline in the input.
The reason is because Markdown is based on email and SourceHut is an email-centric service.