Earlier quoted context omitted.
Most online videos are made by people good at making videos. There not the same people that are good at making drinks or whatever.
Versus learning from the first person you come across in real life? Or not at all because it's all too hard compared with searching the net?
Sure, you can find some videos of people making a wooden clock online. It's much harder to find master craftsman making a watch. A few PHD students putting together an electric car vs. someone at GM actually designing a car. Home cook vs. Five Star Chef.
Granted, generally an amateur is fine. But, don't be surprised if there making several mistakes without noticing.