> Posts like this that talk about learning "efficiency" always come off as soulless and dystopian to me. I think learning should be fun and that fun learning is the most effective
I don't disagree, but maybe the author is making do with what they have. Maybe they only have 30 minutes ~ 1 hour of free time per day (which is dystopian on its own), and need to think about efficiency if they want to achieve a certain degree of proficiency in whatever they're learning.
Another interpretation is that they are only trying to optimize their learning process if it's work related, because they need to. Or maybe they have an engineer mindset, and make the process more efficient is a fun thing to do by itself.