I, fortunately, have no direct experience with this, but it seems that many times, multiple officers will surround a suspect, all shouting conflicting orders. The person faced with that situation is essentially damned if they do and damned if they don’t.
It would seem prudent in these types of engagements, especially when pulling over someone on the freeway with no prior record (if they didn’t run the plates first, they probably should have) that one officer be pre-designated as the primary communicator and scene controller, either via rank, first on scene, or whatever, and the other officers remain silent unless making observations (such as “Gun!”).
Yes, that is much more sensible than all of them rushing the car barking orders.
Still, this would seem to have been a fairly standard traffic stop, and in those situations, there is no conceivable reason to rush the vehicle with guns drawn at all. That they did tells me that they must have been looking for an opportunity to shoot the guy, it’s the only explanation that makes any sense.