You quite literally are proving my point. The line that has 'priority' is the lane that isn't being closed. People are merging over when it is SAFE to do so and they are traveling at speed that is safe and keeps traffic moving. The problem is the person that guns it, (not finding a safe spot to move over at close to the same speed as the rest of traffic) and cuts someone off (disrupts the speed in which the rest of traffic is moving; specifically by making the other person hit their brakes to avoid an accident due to the person that gunned it and cut them off)

You think in the ideal world, not the real world. If I am in the right lane, I have a safe space to merge to the left and I move with traffic and merge over at the time that is the merge point, I AM DOING WHAT YOU ARE ASKING, and by 'blocking' the right lane I am allowing for the merge point to 'loosen' as they no longer have to worry about merging people. The only way this method DOESN'T WORK is if once people have merged they don't accelerate (due to an obstruction/choke up ahead) OR they don't know how to get back up to speed effectively, once that occurs, then finding your spot and merging as you desire is the correct play since traffic is flowing.

When it isn't flowing is due to that jerk-off cutting off people. It is why the whole issue arises, period. People then have figured out if you block the other lane, traffic actually starts moving again, because people aren't freaking out about the merging person and the flow (basically movement before the merge) can pick up again...