I would love to only use the Jones, but as everyone is aware, at the moment, a 6-digit with the old mounting hardware is unavailable. A horse was easy to care for, and people learned how to ride a horse early in life. Now, however, that once "new-fangled contraption" is accepted by all but a few.
No one said the JO was not good. But, so we don't get caught without our supply (one never knows for certain that a single supplier will always supply our parts) readily available, an alternative should be available, and we should be familiar with it, even if we don't want to use it as our primary tool.
I think Neville explained it sufficiently for me. Now that I understand it, it is not rocket science, and I will get one to use, either primary or backup. But, I am down to one JO. I always want a backup avaliable to me, so I have to go with the Totalizer, as soon as I find out where to get one.