Images as illustrations in the code:
Yeah, sure, it would be nice to have the Vitruvian Man in the code, but it's also nice to be able to re-open your text file in 5 years, when development on the IDE has stopped and it no longer runs on current operating systems. Also, animations would be hugely distracting.
Code cells:
With jupyter and spyder I have been bitten by lingering obsolete state from re-running cells or code blocks various time. I find the program much easier to debug if it runs on a clean slate and builds all the state from scratch. If building state takes long, I try to cache, save it to disk, and go from there.
Nonetheless, an interesting perspective.
It's not inserting images into the code. It's a structured editor presenting an alternative view of the code. It's just code. That's all there is to this. Man, frustrating.