Now that 12" CMS are everywhere, what are the pros/cons of the CMS vs
SCMS?

I have the 8.5" Hitachi SCMS that was the rave back then. It cuts 2x
up to 12" 90 deg. Other than that, I cannot think of an advantage of
it over the current 12" CMS. The one disadvantage that I see is it
consumes about 32" of front to back space, while a CMS would only take
24" or less.

Other than the obvious cutting capacity, when would at SCMS be
preferred over a CMS. (the 12" CMS cuts about 8" wide 2x at 90 deg.)

I'd also haved to believe the SCMS has more "play", thus less
accurate.

I do not have a RAS - dont plan to get one. I do have a TS and
crosscut sled.