Like, I have a cellphone with a high resolution camera in my pocket - it would be more then enough to be able to have it image recognize the parts I should be looking for and highlight which bolt I undo next (and ideally, hint and show an arrow if I'm looking at the wrong thing).
One of my primary uses of YouTube videos over service manuals is just to confirm that when it says "undo the secondary philangy bolts" that I'm clear on exactly what that is.
That said, I don't even think that's the key use-case: the key use-case would be letting those YouTubers include the image tags to the right part of the video, since half the benefit is seeing someone who's done it show how they do it, and how they move and place the parts (which usually avoids some "buy Manufacturer Service Tool 3 and 19 to undo intermediate part 81).