AFAIU "Mono" versions are explicitly made to fit programs which require monospaced font. I'm trying to recent release (v2.0.0) with Kitty terminal emulator but Kitty doesn't pick them because it does not see them as monospaced.

After opening a issue kovidgoyal/kitty#527 in Kitty's repo the author told me that monospaced fonts are expected to have spacing: 100 when querying them with fontconfig (fc-query <font file>). And indeed the fonts I've tried (Iosevka, Fura Code, Hasklig) don't have this property at all.

Interesting that fonts from previous release (v1.2) do have this property and are properly recognized by Kitty.