If things don't need any further treatment then yes, of course everything's left flat. Why mess with something unless it needs it? If the FoH guy feels the need to tweak my channel then that's what he's there to do, the point is by not piling a load of crap onto my signal at the stage end I'm giving him the purest starting point possible.
Key words there again... Starting point...
I'm a bit reluctant to make this point again as you've conveniently ignored it every time I've made it but here goes - I do as much processing as I need to for the situation I'm in. Nothing more, nothing less.
Actually though just as a point of interest, I've mixed countless gigs where the vast majority of channels on the desk have been left flat. If the system's well set up then you shouldn't have to butcher channel EQ.
I'm actually the other way round, mixing bands is my job and playing occasionally is.