> The first 15 seconds of the video probably doesn't need to repeat what you already know.

Consider looking at how Mr. Beast does it. He explains in detail in https://cdn.prod.website-files.com/6623b7720b009050313e701c/...

WRT to me: The first 15-45 seconds of a video need to convince me to keep watching. There's more videos on YouTube that I want to watch than I have time to watch, and that 15 second summary is how I decide to keep watching or move on to something else.

There's a workaround for this problem on PC, just in case you're not aware of it. Just press "2" or "3" to skip forward to 20 or 30 percent, which just usually long enough for the filler. And if not, you use "j" or "l" to skip forward or backwards in 10-second increments.