To each their own.
I don't necessarily agree with burning the X slot for a graphic eq to stand out in a mix or for solo boost. At least for me - I *never* use 5 slots in one performance. If I need a solo boost, I create a slot specifically for that purpose. Morph can be used for something else and no matter what slot I'm on - my solo sound is one button press away.
On stage - you have no idea what the audience does or doesn't hear. EQ'ing from the stage doesn't work (at least it never has for me). Balancing a FOH mix is the sound engineer's job. He or she is in a far better position with better tools to adjust on the fly.