Interesting and good to see.
When commuting in my big city,
I usually stay near the lines and/or behind the tires/taillights. I NEVER stay in the center if I don't have to or while traffic is moving.
• I feel one has less maneuvering room
• Less visibility. Both OF yourself and YOUR VIEW of the surrounding conditions. Especially in close traffic conditions.
When near or on the lines I can sometimes see things farther up ahead. That is useful information. For example in your video here, you might have realized that traffic was slowing/stopping ahead.
I feel I'm more visible both to the vehicle at my rear quarter and in the mirrors of the vehicles ahead (if they bother to look, but I have to give them a chance).
Being near the lines also allows access to emergency lane changes or emergency lane splitting. This could be very useful as inches if not feet are saved from maneuvering when things are getting tight quickly. The gap is right there in front, not two feet away after a sharp left or right turn...
Only had your type of situation once really. I had a pillion on the back (a guy) and the bike was thus way heavier. This was also on the freeway/highway/whatever you call it over there. When the car/traffic in front stopped suddenly and the car on my right did not allow a lane change (was a merging on-ramp), I did not slam on the brake but slowed and allowed the bike to thread between the car in front and it's neighbor to the left (I had already assessed that this was possible and was closer to that side at the moment).
Riders often say, "Everyone wants to kill you." I don't agree.
I mention in a
Street Strategies video of mine, that I believe everyone wants to go faster and no one is looking for you. Which seems to be exactly what happened in your video. The amateur driver/rider is only looking for where they can fit - how they can go faster, etc. I look for what I think others might want to do. In my video I try to give a few clues (among many possibilities) that might indicate intention.
What ever happened, if you made it home safe: Good Job.