Fortunately I don't burn much brain-fuel over the wires in my speaker (or otherwise). Whatever Thiel chose, it met the values and specs they were going for, and the results are speakers that are still highly competitive with anything today, whatever wiring those other speakers may be using.
For me I've got enough in this hobby to obsess about, without throwing concerns about high end wires/cables in to the fray. I'm as prone to thoughts of upgraditis as anyone else. Having recently acquired a high end turntable, now I have to think about things like VTA, VTF etc - I've gotta draw the line somewhere and my skepticism about the high end cable/wires industry makes dropping concerns for expensive cabling an easy move for me.