Anyone else hate it when you watch a youtube video and you don't see what the final product looks like or maybe even what it is until the end of the video? You need to watch the whole thing or skip ahead to figure out what is being built. Much of the time I really don't care about the details, but might want to see the concept. Maybe sometimes I do care about details and dimensions, but only once I know if the item even interests me.
It really is annoying when I sit through someone droning on for 20 minutes only to find I wasn't really interested in what they are building. I don't get sucked in much any more because I'll skip to the end to see the finished product before investing the time of watching the video.
Also sometime even after watching them drone on for 20 minutes the concept of what they build still isn't clear even though you have dimensions and details.
That said as a general rule I actually prefer more concept and less detail in videos about novel stuff like a new jig concept. Details are critical when teaching how to do something. Yes some videos may be trying to do both and that might be appropriate in some cases, but I'd like to see more "this is how this jig works" type videos. They could add a see "my detailed build" link for those who want it after seeing the concept.