they like it because
# title
this is the paragraph
is more natural to write than:
<html> <head>...<head/> <body> <h1> title </h1> <p>this is the paragraph</p> </body> </html>
when you're just jotting some thoughts down.
# title
this is the paragraph
is more natural to write than:
<html> <head>...<head/> <body> <h1> title </h1> <p>this is the paragraph</p> </body> </html>
when you're just jotting some thoughts down.
If you rewrite your comment with lists I think your question becomes self-explanatory.
<h1>My Title</h1>
<p>This is a paragraph.</p>
You can comfortably read plaintext that has a little structure, while HTML adds some ceremony that makes it a bit harder to glance at the material as the tags are much more in your face.