Videos are useful when they're 3blue1brown style taking advantage of the format. They're a waste of bandwidth when they read from a script with some footage/stock photography in the background.

Even then, a lot of the video may not be useful to a particular audience. Being able to scroll past a sequence of short animations could be even more valuable -- especially because then you have the opportunity to include more optional branches via links or tabs or user preferences, and make the content even more accessible without making it excessively long for all audiences.