The type of people who see a "lane ends ahead" and immediately merge, blocking up traffic and wasting a half mile of empty lane. "I'm in my assigned place and I did what I was supposed to!!"
If everyone gets over at the first opportunity, then things go fine. The empty lane isn't wasted, it absorbs brief bursts in traffic that need more time to get over. But even if it was wasted, that wouldn't be a big deal. A 5-mile long section with fewer lanes and a 5.5-mile long section with fewer lanes will have almost the same throughput.
Everyone staying split across two lanes until the end and aligning themselves to do a clean zipper merge also goes fine.
What makes everything go wrong is when people drive down the nice empty lane that's ending and intend to do a normal merge at the end, but they don't start it early enough. Then everything slows down as they squeeze over.
You mean the people who must get past every single car and merge at the last possible second?
What I often see if a lane that intended to go through and a turning lane that is backed up; people pretend to be on through lane, then stop to merge at last minute into long turning lane and void the line.