A gap while moving is pretty good. A gap while at a dead standstill pushes the congestion back farther, potentially causing it to interfere with traffic going in a completely different direction. Leaving a gap while at a stop makes it less likely for others to get into the left-turn or right-turn feeder lanes. Meaning they'll still be there, possibly interfering with the trough lane as they miss the dedicated turn light and have to sit and wait and possibly back into the through lane.
On my way home yesterday I saw a person well beyond a car length in a middle lane on an off ramp that had three lanes. One lane went left, one went right and the middle one, the one they were in, split and fed both a right turn lane and left turn lane. This driver was in the higher demand left turn lane. Stuck in that lane two cars back was a person trying to utilize the left lane of the right turn feed (which is massively underutilized at this exit, yet the lane probably 80% of the people should be in since most of them are trying to get to the large shopping center that requires a left turn at a very close intersection not even a full city block after the exit). Had that one car gone nut to butt in their left turn feeder the other car would have been able to move up and actually use the left side of the right turn exit.
Final note. The guy in your first video I want to punch in the face. Zen? How is laying on the horn because someone is merging AT THE MERGE Zen? That guy is exactly who I hate. Neat that you like to create quarter-mile gaps in traffic and then get triggered and turn up the temperature on the roadway by honking for an excessive amount of time when someone moves into that gap when you don't approve.