I think you're mixing everything together. >you can just speak as you go while shooting a video You're comparing a "good blog post" with a unscrippted/uneddit

I think you're mixing everything together. >you can just speak as you go while shooting a video You're comparing a "good blog post" with a unscrippted/uneddited "video log". It's not the same - it's comparing Louis Rossmann VS iFixit. One is a form of educational entertainment, or entertainment, other it's a guide. You can learn from L.R., but it's not a step by step guide. You don't need to go back and try to find time stamps, you don't have issues of not understanding something that got muffled by him moving, you can miss a reference, etc. If you're talking about video guides, then they are scripted and will for sure be harder to edit than a blog post. There's a place for everything, and production costs (SHOULD) reflect on quality - the medium is irrelevant.