If you use an aux instead of the Fx1 bus send to send to the Fx1 proc, the Fx1 bus send is lost; you can no longer use it for another Fx proc.
Sometimes I want to keep a chronological order of my auxes in the order 1, 2,… to the Fx procs and also with Fx sends, but that requires starting with something other than number 1.
Finally, a workflow suggestion… maybe not interesting, maybe yes.