Screenshot-based tutorials are nothing new, and I'm curious if you've thought about the primary issue (IMO): UI can subtly change over time rendering tutorials confusing and misleading.
Just today I was looking at some Windows setting that moved and it took me extra time to find the new location of the setting. The easy answer is some kind of report/moderation process where you refresh the screenshots, but at that point I might as well just google for up-to-date tutorials. Have any innovative solutions?