Font substitution is a major issue for document fidelity, so it definitely deserves a meta bug. Indication and Information Bug 61134 - Font substitute name should appear in the font combobox and tooltip Bug 78186 - Show infobar that fonts are missing and list their substitutes Bug 96872 - Make it more obvious that a font has been substituted Substitution Table Bug 64509 - CONFIGURATION: Enhance Font Substitution Table Bug 91004 - 'Tms Rmn' font should be substituted for Times New Roman or Liberation Serif Bug 98650 - Fira Mono fonts poor replacement font metrics Bug 55255 - SchuDruck1 font not substituted correctly
How we plan to deal with various aspects of font substitution. https://design.blog.documentfoundation.org/2016/10/21/dealing-with-missing-fonts/
The google doc that was used to create the blog post in comment 2 that has addition details that wasnt published. https://docs.google.com/document/d/1mbs-NW_w8lczMyMwUl5Uc0GYuhFK_KE6g7NASZBnIM0/edit?usp=sharing