Most of the time, by just looking at the multi-lingual pictures that come with that Ikea thing, I can have it all put together before he even finds the correct video on youtube.
However, most videos can be paused, reversed. speeded up, fast forwarded, and they can show me exactly what it should look like when it's done. Or what it should look like from the inside...at the half-way point.
I like written instructions, but I really like pictures & videos too.
I once went to a class to learn something new, and we just watched a video. Then discussed it...answering any questions. Not what I was hoping for.
Maybe both have their place in my world.