I think that pro teams watch film and so they have BOTH. There are two drawbacks that video presents that you don't get from written materials:
1) Written materials can provide multiple dimensions at once. Here's the Browns' 2000 offensive playbook. Here's a page from the playbook (page 252 of 554(!!!)):
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That's 10 variations of the same play (Ride 136/137). If you're a different position (RT vs LG, for example), you're being shown what your responsibilities are. There's a greater density of information here than you would get from a video, which can only show one instance of a defense, for example. Each play is 7-12 seconds long. So in what it takes me to scan for my position on 10 plays, I'd have to watch over a minute of video.
2. Written materials are (generally) random access, while video materials are (generally) read-only. I opened this playbook and flipped to page 15 then 29 then 125 then 252 to find what I wanted. If this were a video, I'd be able to skip over to 2:23 or whatever, but I don't have a context for where I'm headed.
Yes, if I'm learning how to re-set the oil light on my Honda CR-V, I'm going to run to video. But, if I want a handbook to study and be information-dense as well as searchable, I need text.
As I said, listen to the podcast to hear from someone who has been seeing spread/air raid concepts for some time and has been watching defensive coordinators try to adjust and defend it. I happen to believe that Goff is an extension of McVay.