I kind of anthropomorphize the devices in tests like this, so it's a bit sad to see the poor things made to run until their legs fall off. But it's nice to know they run farther than expected.
I agree that it's not a good idea to defrag an SSD. But I'd like to nitpick your assertion that there is no reason. Even on excellent drives, 4k random reads/writes are not as fast as sequential.
For example, the SSD in my machine, a 120gb Intel 330 series, can do ~88 MB/s of random 4k reads, but 500 MB/s of sequential, a multiple of ~6x.
Now, a Seagate 5 TB drive will do 146 MB/s of sequential reads and ~470 kB/s of random access, a difference of ~310x, so SSDs are punished for poor access patterns significantly less.
But it's probably possible to manufacture a situation where defrag would indeed give significant benefits. Whether it's ever seen in the real world is another story.
