For me it was efficiency of reading. It is proven that proportional, serif fonts read significantly faster (17%) [1] or [2] (6.1%). Also, in my opinion, scannin

For me it was efficiency of reading. It is proven that proportional, serif fonts read significantly faster (17%) [1] or [2] (6.1%). Also, in my opinion, scanning is much faster. This makes sense: our eye uses the top and bottom of words to ‘key’ the word. Use proportional and you add information to this system. [1] https://blog.codinghorror.com/comparing-font-legibility/ https://blog.codinghorror.com/comparing-font-legibility/ [2] https://journals.sagepub.com/doi/pdf/10.1177/001872088302500303 https://journals.sagepub.com/doi/pdf/10.1177/001872088302500... (edit: add references to research)