It’s also a much more reliable method to provide instructions on how to do something.

Instructing people to click on “this button > tab > menu > submenu > item” is very exhausting for both instructor and reader, it’s language-dependant and less future-proof. Also sometimes the location of some graphic elements isn’t immediately obvious and there are cases where the only way to make sure people understand it is with a video tutorial of sorts. Which is annoying both to make and to have to sit and watch through.