I said "technical information", which does not include building cars or houses. In the context of this thread, we're talking about computers.

Videos are not easily indexable or searchable, and cannot have information therein easily disseminated to others. Textual content can also have useful contextual links for additional resources, which is more awkward to do with video (generally it's just a link dump for the whole video in the description). Also, humans can read much, much faster than we speak, so videos are a slow method of communicating information. You can mitigate it slightly by speeding up the video, but it's not really enough.

That all being said, videos are useful for topics like you mentioned that greatly benefit from having someone show you how to do something, i.e, physical tasks. It's much less useful for topics that are more abstract or conceptual, especially those that synthesize concepts from a variety of sources.