I've been thinking about this thread past couple of days. Dangerous as that may be, it's possible some of us (like myself) may've swerved off Drumstruck & AudioWave's point - that the DM mixers (the 4800 in particular) offer far more channel module real estate than the most 'popular' (firewire) single interface is capable of transmitting bidirectionally at any given time. So logic (not the DAW) suggests that leveraging the native power of a modern DAW (with potentially 100+ tracks) with a more robust interface (MADI, for example) is something that should at least be explored.
I pulled up a ProTools session over the weekend; lo and behold, there were 39 individual 'ribbons' in the session - many of these, multiple/comp takes of various parts. Ironically, these extra tracks were, themselves, a workaround to defeat the latency drawbacks of performing punch ins while monitoring OTB on the DM. So, essentially, this extra material was never intended as 'increased track count,' but rather 'harvesting' sources for purposes of bussing or routing into the restricted firewire 'sphincter' to the DM. What if that weren't necessary, and those original elements could be dedicated to an outboard, discreet pathway? Well - something like MADI would allow that. In that scenario, every DAW element would have its own channel on the DM - up to, perhaps, 88 if desired.
So, in a sense there's a routing advantage to having more than 32 bi directional channels. However, whether that capability leads to better - ie: sonically improved - mixes is a separate debate. But it's arguably an advantage worth considering for many users, while perhaps, an unnecessary complication to others.
Did I get any of that right?
CaptDan