I figured it was just a matter of time until he at least tried it. I remember watching him give an interviewer a walk-through of his huge setup. All I could think was that he could achieve most of this with the Axe-FX. But that sort of setup develops over time and must be hard to jettison, especially if you don't have to move it or set it up yourself every gig.
TBH, I've seen them 13 times, and I thought his FOH tone was not so good (actually, the entire mix was usually not so good, sometimes HORRIBLE). Two exceptions were the pre-Signals tour (actually called the Spring Training tour), where I was on the barricade and could hear the on-stage cabs and cymbals directly, and the Presto tour, where the sound was head and shoulders above any other Rush tour I've seen. I've seen them a few times where the sound sucked so badly that I wanted to leave after the first song. Just goes to show that an awesome setup doesn't guarantee great tone in the FOH.
Compared to other acts I've seen live (especially Pink Floyd / Roger Waters / Paul McCartney), I think Rush's live sound generally stinks. I've seen them all play the same venues, so it isn't simply a matter of the room. I continue to wonder why this is.