I had a similar conversation about this kind of stuff over the weekend while teaching a friend to fly cast on the river.
Early on, we have to focus on some real basic stuff - casting, learning to feel through a rod, very basic presentations. And this stuff is a lot to focus on early. Simply, we don't know what we don't know. There's a whole lot of excitement and a whole lot of ignorance that comes with it.
Once you get the basic stuff down and you put in years of data entry (be it via a notebook, journal, laptop, or the ol' brain), you realize that a whole lot of your learning happens off the water. This, to me, is a big step that a lot of guys just don't take because it feels like work to read maps, water gauges, fishing reports, tournament results, researching different ways to present, and of course practicing off the water. It's a lot more than filling a cooler full of beer or rolling up whatever and simply heading out for the day to try your luck. I find that I get much luckier the more I fish mindfully and put in work.