I certainly feel the effects of what Hermann Ebbinghaus described as the "forgetting curve". For me, it's a case of "use it or lose it". You can see this effect in action in the first 20 minutes of this video where I try to remember how to create an Ubuntu container. Crazy. I felt like a novice again. So I understand the reason for saying "learning design should incorporate spacing". You want people to keep going back to what they've previously covered. But here's the thing. If you're not actually using the stuff you learned at the start of the course later on in the course, then why did you learn the stuff at the start of the course? It seems to me that 'spacing' is just a response to bad course design. It's what you do if there really was no reason to learn the stuff, but it's in there anyway.
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