This study tracked study resource usage in 2021 and mentions a study in 2006.
In 2006 medical students spent 10.8hours per week studying with textbooks, on 2021 4.2hours.
So under 40% the textbook usage as 2006. That's a fairly precipitous decline and it's pre-LLMs being mainstream. I down chatgpt 4/5 have sent the students back to the library!
It mentions question banks have expanded as have online resources. Also learning style has changed from lecture based to problem based learning.
I can't say this is objectively bad. But that I'm sure it contributes to narrowed knowledge bases.