I agree in principle, but
- I don't
- think that
- individual paragraphs
- for a list
- is a very good
- use of space
- on small screens
- or on large ones
Code blocks are crappy for small screens, but so are lists written as a series of paragraphs.
Unfortunately, HN seems opposed to supporting non-paragraph linebreaks, lists, blockquotes, or any other sort of formatting. That's fine, it's up to dang and the other admins who run the place and they don't want to support other formatting, but it means that the code format gets abused as a poor approximation for these things.
EDIT: I should also point out that your source says "fixed-width is intended for code." You left that word out and it's an important one. If it said "is only for code" the meaning would be different.
Side note, reddit lets you do a line break by ending a line with two spaces before hitting enter. Just tested to double check, it doesn't work here. I wish it did, and replacing space-space-newline with <br> seems like a pretty trivial and unobjectionable feature, but here we are.