You always lose what you don't use over a long enough time window and in proportion to how much you used it when you did use it. Everything that is true about this 10 minute video is true about a college course. You just retain the college course for longer because (presumably) you've spent more time in class than a 10 minutes video and you've done your homework. But if you don't use it after college, there's a strong chance you've forgotten the details.
Sometimes it's just important to know a thing exists, what it can be used for, and roughly how it is used. Everything else can be learned or refreshed when you need it.
Suppose you've watched that stats 101 video but didn't follow up. You now know:
- The broad strokes of stats 101 even if you don't have perfect recall on the details.
- What it can be used for.
- Whether the particular video is worth watching when and if you do need to use it.
Initial exposure is important. A claim could be made that if nothing is ever done with it, it is a waste; but how does someone without any knowledge know enough to decide whether they should go further with it or not?
