a lot of the arguments make me think of two different approaches to a task: breadth-first v.s. depth-first. for most tasks, you almost always want a balance of the two. in general, when you're young you explore the breadth of relationships; and after a time you understand which aspects are most important to you, and you pursue the depth of a smaller set of relationships.
now there's a lot of surface-level media out there. the kind that tells you about some thing without explaining it. you might listen to a broad overview about current topics in electrical engineering. by doing so, you learn about the avenues available to you and then later you go and do a deep dive into the specific avenue you want.
> The world rewards people who develop expertise in a specific subject.
indeed (modulo that your "specific subject" could just as well be a niche blend of classical subjects). pushing the envelope requires a deep approach to learning -- the version where you listen at 1x, pause, and then draw new conclusions/connections that even the author missed. but if you're still in the earlier, discovery phase of your growth? then what you really want is the 3x speed, breadth-first overviews.
not all information is equally valuable. if, by using 3x speed, you can more quickly locate the areas of study which are highly valuable to you at the expense of failing to integrate a bunch of information that is of low value to you, that can be a fair tradeoff. understand the tradeoffs; be explicit.