Hi,
Preface: I have never used the 'split thread' method but I intend to try it soon.
Having said that, I realize I hadn't considered the benefit that Hans cited. He said, "there is no tie-down point ." Also, reading Hans' comment, I realize there's no 'tie-off' point either. I can see another benefit to the 'split' method versus using a 'loop'. If you're using 8/0 thread and prepare a dubbing loop, the thread becomes twice as thick. Split the thread and it stays the same thickness. Lastly, you won't need to look and fumble for, or use, a dubbing twister.
Just a few immediate thoughts.
Allan