Have you ever tried to build something based on a video? It’s tricky. The thing you want to see in detail vanishes in a second.
Long ago, there was a company called Heathkit that made electronic kits. They were legendary for their excellent instruction manuals. The sad fact is that writing a legendary instruction manual requires legendary effort, and 99% of DIY article writers don’t have the time or the skill set to convey everything that needs to be conveyed to an inexperienced builder.