If it can be put into a book, it can be put into a presentation. "More efficient" is in the eye of the beholder, different people learn in different ways (see Audio Book Vs. Book Vs. eBook for another example, an Audio Book is less "efficient" too).

Personal training/mentoring isn't really even in this sphere in terms of cost/opportunity/availability. If it is free & high quality at work, great, but then you wouldn't care what YT/Pluralsight/et al has to offer.

> If it can be put into a book, it can be put into a presentation.

Would it be fair to say that there're actually a lot of videos on such more advanced topics, but they typically are recordings of talks from various conferences?