People say that of the early bonanzas too, yet mine sat down a couple of times for 6+ months at a time while looking/waiting for parts, and the parts I sometimes ended up with were only marginally better than what I had before.
I realize the t-bone community takes care of itself fairly well. But even within that group I recall the consensus being that the t-bone did not have the dispatch reliability or support to be viable for charter type service. The fact that Bemidji is the only operator I'm aware of using the QA/t-bone for revenue service reinforces this.
I realize that's not exactly what we're talking about here but it is hard to deny that there are fewer parts sources and options for a t-bone than there is for an Aztec. How many sources are there for new GO-435 or GO-480 cylinders? How many sources are there for parallel valve IO-540 cylinders? How many prop options are there for T-bones, are they available new, and what is their cost? I think the Aztec will start to look more practical when bigger parts are needed, but thankfully neither of them should need too many.
Believe me, I would really like to have a twin Bonanza or queen air but I don't need another flying project to keep after. I suspect it would be a nearly full time job to keep it in the shape I prefer. I'll stick with twins a couple of decades newer, they're bad enough.