I don't understand why it's so hard for some people to agree that those tasks are both hard and valuable ...
I much prefer solo heart days to GI days (solo or not!), for lots of reasons.
Efficiently and safely sedating a parade of BMI 50+ trainwrecks for endoscopies, whether or not you have to trust some revolving door CRNA-of-the-week you don't know, whether or not you're also running 2 or 3 other rooms, is hard and high risk work. Even ordinary ACT work that isn't especially high turnover can be a very busy, difficult day.
It's funny but the only people I ever hear tell me that doing hearts is easy are people who don't do them. It's usually old farts who don't do hearts any more, but are oddly proud of how they used to do hearts. It's almost as if they are saying "Yeah I could do those hearts that you're doing ... I just don't feel like it." It's a very weird kind of ego flex coming from people who should know better.
A couple days ago I did a solo heart that was booked as a "CABG + possible AVR" ... could the average 4:1 GI center ACT generalist anesthesiologist have done that TEE and made the appropriate measurements and given an informed opinion to replace or not replace the valve to the surgeon? I'm going to guess no. I think that was a hard skill for me to pick up, and one that has value. Still, I value what they do, and respect that they do it well.
All of this is why I'm firmly in the camp of (anesthesiologist paycheck) = (group total revenue) / (time worked) being the most fair arrangement. Time worked should include necessary administrative positions, even if that time doesn't generate billable units. Even if not everybody does every kind of case, even if some people have schedules tilted toward hearts, or OB, or ortho/regional, or neuro, or surgicenter ACT days, everyone should get paid for their time. When I was looking for my post-Navy and hopefully last-job-ever position, I ruled out several otherwise attractive places because they didn't work this way.