[rgonzalez]

1) Why is discoverability awful? How would you change/improve it?

2) So a tool/place that takes into consideration what you already know and gives you suggestions on what your next steps should be would help you on your learning process?

[ig1]

1) Try it and see (pick a topic like "pyschology" or "linguistics" and try to find the best introductory course).

It's broken in pretty much every way possible, you can't sort the content by ratings or popularity, you can't browse by lecturer/publisher, there's no recommendation system, there's virtually nothing to distinguish between lectures on the same topic, some have awful sound recording but you have no way to know unless you listen to them, etc.

2) I think the more fundamental problem is that knowledge generally isn't available in small discrete chunks but rather in books, lectures, etc.