But I would like to add that getting a high-level overview also helps me to gain a clearer and better integrated, more contextual understanding. This is especially important when I learn “hard” things (although this is a very relative term), since usually those things have a lot of unknown unknowns that often reveal themselves in this process.
That is why I like watching talks about the subject, reading articles and opinions, etc. which are more related to the conceptual stuff and the thought processes behind it. Usually I will then build a concept map and connect things I know that relate to the subject (I like using a PKM tool like TheBrain for this).