SAC is nice, but like most of Bob's products, pricey! Yes, I've used it and Saw Studio. SAC is quite a departure from a physical console, and takes some getting used to. Personally, I prefer other interfaces and I'm still somewhat of an analog "grab the knob" kind of guy. Don't want to dig thru 4 layers to turn down input trim.
And "most" sound people I know, do what they do 'cus they love it. Sometimes they have to work with the cr*p they are given by the house versus equipment of choice. And yes, there are tone-deaf sound people out there who can totally hose things, but if you "work" with them and are not dictatorial, you can get done what you need. Counter to popular belief, cranking an amp to "eleven", a la "Nigel" (so you can "feel" your sound) does little to help the soundguy get a good mix. It might be that approach that coined the phrase " Can we get a little more talent in the monitors puh-lease?"