Yes, there is always verbal instruction (not really explanation) to start with the students. For example, most students I work with don't know how to open a terminal ... they need top-down guidance with copy and paste. The most explanation they would get at the start is that a terminal is where you can copy text and see a response. Pointing them at a web page with directions (mine or others) has never worked for the vast majority of them. The Rust pages in particular... some of them would not understand that they have to press the greater than symbol (>) to go to the next page, and almost all of them would not know they had to strip $ from the commands (or have a clue what Linux is). I think the success rate would be near zero (0%) for that Rust guide without hand-holding. Of course, once they've seen how to do something, they should not need as much handholding.

So eventually we come back and redo the content ... and that becomes the time that explanations are added.

I do like the Rust doc for experienced devs though, although I'll quibble that the doc is not good for Windows users. I'm add a separate explanatory quick start for experienced devs.