It's also annoying when they don't show how the finished result works until the very end. This video is also guilty of this (you see the device, but the video call where it's being used is at the end).
Why waste 10+ minutes watching it being built, then finaly get to the end and discover it you don't like the result. Of course smarter people will just click to the end at first, but I'm guessing much less than half of people do that.
Sidenote: Does anyone know why these videos all seem to be at least 10 minutes long? Is there better monetization after a certain threshold?