Are you thinking of the switches that swapped the pots for Auxes with the faders for Groups?
That never changed the flexibility, just the location of the control.
I’m not sure the hardware is in place – the matrices don’t take signals from the channels directly, the groups do – but only as part of the main mix if it is similar to the analogue A&H desks I’m used to – the mix is sent to the group(s) selected, and L(C)R based on the routing selection, but it’s always the same mix…
Am I missing something about the bigger QU desks (quite possible)