I think the reason they do it that way, and also your math teacher, is that that they aren't trying to just show you to get the answer, but to teach you how to play, or do math, or whatever.
Having said that I do concur with you if all I'm wanting is a quick run through of how to do something and then I'm good. If only the person making the video knew that? I find myself saying "C'MON C'MON C'MON!" trying to get to the two minutes I'm looking for.
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