I'm not sure that this is a very good analogy. You can buy a heavy bag, and go out in your garage and throw 10000 punches - with no instruction - and still not know how to throw a proper punch. OTOH, you can watch a few videos, learn some technique, and then go refine it by throwing the 10000 punches in the gym, and be a lot better off. Of course, it still won't be as good as hands-on training from a proper trainer, but my point is that you need both in the boxing case.
For physics... eh, I dunno. My original plan for college was to major in physics, and then I discovered computers, and physics went (mostly) out the door and in the rear-view mirror.
Exactly. Feynman lectures tell you what the laws are, and why they make intuitive sense. They don't tell you how to apply the laws to a wide variety of scenarios, even those not discussed in the book. Physics textbooks like Haliday & Resnick do exactly this; briefly state the law and then teach you how to apply the law.
But merely reading those textbooks won't help you either. You still have to turn to the exercises and solve a bunch of questions correctly to actually learn.
We actually agree, almost perfectly.
I contend that for some, including myself, they are an incredibly powerful tool for building an intuition. Not only after other studies, but during and before as well.
You say your part as someone who teaches, and that's important. Conversely, I say my part as someone who has learned and is learning.
But we are in almost perfect agreement.
Let's imagine physics=boxing. No amount of reading boxing books, or watching boxing videos is going to teach you any boxing. To learn boxing you have to throw 10,000 punches. To learn physics, you need to solve 1000s of questions. That is the necessary and sufficient condition for understanding physics.
Same way one learns software engineering after writing 100s/1000s of programs, not by watching videos of smart people coding (though that can help make you better).