The purpose of this is for the note takers of Dynalist. Drawing pictures or doodles to accompany what you are trying to memorize is a promising way to achieve your goal. Being able to do a simple version of this within Dynalist could be very helpful.
I am aware that Dynalist supports images, but you can imagine drawing outside of the app, uploading it, linking it, etc can be more work than you expect. Evernote is a competitor that supports this.