Although we are TT'ers, we have been right on the edge of switching to a TC many times, for all of the reasons given above. We do boondock a lot in our very small TT, in some fairly crazy places, but a TC can get even further back into the boonies.
Interior space (and the shower!) have kept us in a TT -- our dinette benches become very comfortable couches for reading in the evenings. Yes, we spend a lot of time outside -- but it does rain now and then, and it gets very cold at 9000 feet in the Sierra. So it is nice to have a place to sit, especially when we are camping in late autumn or early spring.
We use the TT as "home base" for our daily activities, using the unencumbered truck as our daily "exploring" vehicle. But really, a TC could do the same thing, if you unload it.
I must add, though, that probably almost every RVer has some of the same emotional attachment to the RV as described by the OP (perhaps not as powerfully, though). To all of us, our RVs trigger thoughts of camping and fun and family and friends. Very few inanimate objects carry that kind of baggage! (For example, I don't think of my computer very fondly, or my passenger car, or my household appliances.)