Riiiiight....The problem is that the video assumes:
1. All drivers are aware of the procedures.
2. All drivers WILL PARTICIPATE
3. All drivers are leaving space TO zipper merge
4. All drivers are paying attention
5. All drivers are maintaining a similar speed.
Amongst other things. However, I'd be hard pressed to think of a time IRL that I ever saw that in action with the exception of specific places that post specific signage to "use both lanes until the merge" (verbiage varies by states though).