I tend to agree that we go way overboard on the single ropeman, but it is a single point of failure. I've got some dynamic rope I might mess around with as a tether to see how it feels. I think the issue is really for the folks that are XOP hand climbing because they have the potential to build up a little slack which could lead to a larger fall and therefore more kN's on the system. Normal tether use after climbing with a lineman belt isn't really an issue in my mind.
I do think it's a good idea to never have a single point of failure, and I'm going to upgrade my line that connects my XOP hand climber to my harness, I've been using an old strap, I think I'll upgrade to some accessory cord or a spliced Amstel loop, not sure because I like to pull up on it with my hand.
Here's Petzl's take on a single rope, which is the closest thing I can find to what I do when I climb with my XOP hand climber.
https://www.petzl.com/INT/en/Sport/...o-ascenders?ActivityName=Multi-pitch-climbing
Curious what other folks think. I've got a few ideas, but I need to play around a bit before I post anything and look like an idiot, lol.