I thought the point was reducing cables. You still have two that have to be threaded under the desk (unless you have the poor taste to have outlets in the wall above your desk).
Indeed, you do need two cables run under the desk. I was merely pointing out that your assertion about my statement that I only needed one cable between my computer and desktop was not correct, probably because you misread it.
Again, for device to bulk storage transfers, you still need compatible hardware for direct transfer. I don't mean to sound like an ass, but direct FW transfer is a pretty damned small market.
It is these days, mostly limited to the professional market, but largely because Firewire never took off as a mainstream standard. There is not technical limitation to Thunderbolt that requires a computer involved in direct transfers, as USB does. This means if Thunderbolt does take off, this limitation is removed and all those use cases open up for direct transfer between devices of all sorts, sans computer.
I'm hard pressed to find a fractional need beyond the fourth percentile decimal that would require a physical drive local at a machine the has to be transported regularly or locked up.
Lots of people are lax about security, but not everyone. When it is simple and easy, I find it nice to put my work in a fire safe for the night, where burglars and accidents do not threaten it. For more sensitive contracts, it also greatly reduces liability.