This is pretty niche but would be a very cool feature.
I have 2x IP8s and a c1500
when I push Mix on an IP8 it only Affects the surface.
but with Unit grouping, let’s say you, group, 2 IP8s so the mix button on 1 unit affects the other and vice versa
giving you the option to have a on the fly monitor setup with 1 console.
or if you group the console and 1 IP8 the Macros and Mix buttons work together but leaves the other IP8 to have stationary faders that don’t move if that unit wasn’t at FOH or if you just wanted dedicated faders