I'm kinda confused on this subject all of a sudden....
I too have been told that the more midrange-y eq can be heard better at times on stage, but doesn't operating in your own sonic frequency range have something to do with it? If I'm too close to the sonic range of the guitars and/or vocals, how does increasing the midrange of my signal, where those instruments reside sonically, help me "cut thru" or be heard better? I'd think 100-400 hz is where I can be heard the best. Yes, I know the ear is more sensitive to mid-range, but I'm talking about competing frequencies and instruments in a band setting. I'm not talking about cutting mids completely, either.
Or, put another way, if I'm a flower in a meadow of all yellow daisies, wouldn't I stand out better as a red poppy than I would a yellow dandelion?! Yet, I keep hearing that to be seen (or in our music world - heard) I need to keep bringing on more yellow.