The more I study (halfway through a tough PhD now), the more I realise there's an obsesion with making hard things harder, sometimes just because you were taugh

The more I study (halfway through a tough PhD now), the more I realise there's an obsesion with making hard things harder, sometimes just because you were taugh that way, other times because hey, "it's post-graduate education! it´s suposed to be hard". And the many times me and the research group I work with have sat, read things from the basics upwards, doing an effort to explain everything as simple as posible, while not hiding complexity, it took a lot of effort, but our work was highly praised and moved back into the courses we teach. And students are happier (or at least not miserable as they used to be when teaching hard things was done "the classical way"). So I agree with (1), and all I can say is that, when in a position of teaching, it's best to take the time, work our material from the ground up, and teach it in the simplest posible way.