Are typefaces for writing different from typefaces for reading?

jaimes

I've played around with different typefaces for my websites, and I keep coming to a divide between reading and writing.

For writing I find I need generous letter-spacing. For reading, the repetitive pattern of the wide spacing becomes a distraction, and I prefer more compact fonts.

I see that the Terza family capitalizes on this idea, with sub-typefaces Terza Reader, Terza Author, Terza Editor.

The Author and Editor are quasi-monospaced and monospaced respectively.

For my own writing in prose, I find monospaced fonts too rough, but the fonts I like for reading (e.g. Sanomat Sans Text) are uncomfortably compact for writing. I end up preferring wide-stance fonts like Zed Text or Verdana.

For coding, I think that monospaced fonts are just too convenient to eschew, and somehow they don't bother me for code as they do for prose.

Are the debates about readability settled?

Are there proportional typefaces designed specifically for writing?
And, if a typeface is knowingly optimized for writing instead of for reading (therefore publishing), isn't that going to shrink its market?