RUME Conference - Portland - Day 3 further thoughts

Darryl and I also got talking about a couple of things that came up in one of the talks. In particular:

1. "trimming"
2. "decompression"

when teaching mathematics.

By trimming, I guess we are talking about the instructor, acting as expert/guide, trimming away potentially distracting surplus or unnecessary details when they teach a course.

By decompression, we are talking about taking what is sometimes quite dense and maybe even simplified mathematical results or statements and unpacking them, maybe even making them more complicated (in some sense anyway) to teach them to people. 

Does anyway have any thoughts on these? Particularly if you teach yourself and either actively do these, or (like me) did them without realising what you were doing?