The problem with tethering to Lightroom is that (last time I looked anyway) you can't change camera settings etc. I've taken tens of thousands tethered shots over several years using EOS Utility and a watched folder (via USB). I'll have to try it with Ethernet!
I don't understand why people don't like DPP? Yea it's kind of a 1999, Microsoft looking interface, but it's rock solid, it's FREE and nothing will process the look of a Canon file (without work) like DPP.
The ethernet tethering is just the most stable tethering on the planet and you can run a cord from the studio to 7th ave. if you wish.
I can understand if you want to show a final look and want to do some faux post work via lightroom, but in that case, it takes a digital tech, or some third/fourth/fifth assistant that just taps on the lightroom folder every now and then to refresh it.
I guess the only problem in using a third/fourth/fifth assistant is you'll have to show him/her how to work software that actually has a real serial number.