Earlier quoted context omitted.
A comment on reddit said they use it all the time when following coding tutorials. Seems like a handy use case.
That brings up a second question: who watches coding tutorials? I'd imagine it's probably people with less than a few weeks of coding experience, because it's horribly inefficient compared to text tutorials.
In the end everybody eventually needs to learn from written content; not only for the viewers efficiency, but also because it's more efficient for content creators to produce written content over video content.
You can even guess your 'reckon' from looking at the kind of video content that is out there - again, this seems mostly to be a consequence of creator efficiency.
With that said, who cares?
Hell, I sometimes hit up streams - for instance, Antirez has been streaming himself building out parts of Redis 6, because it may introduce me to new techniques or minutae I didn't know. It's way, way, way more chill than reading source code, and it's a lot better than the blog post on it he probably won't write.