Hi. I made a video about typefaces informed by lots of research. I think it will interest you in particular. www.youtube.com/watch?v=zHSqLujs8E8

PhD theses in aspects of typography are increasingly popular. https://centaur.reading.ac.uk/view/divisions/5=5F603850e0.html

There are some good papers here: https://typography.network/typographypapers/

I watched this film a short while ago. I recommend it. https://www.canadiantypography.ca/archives/items/making-faces-metal-type-in-the-21st-century-jim-rimmer

I'm very glad to see this site maintained and added to. When beginning my studies of typography, it served as a valuable resource. Keep at it!