== Strutting down the street in arrogance, and saying "look at me, I talk smart" == 

 what part of lose the elitism and arrogance and NOT everyone knows off hand what uh "nom de guerre" means, and this stuff is also for causal readers too, not just for PhDs or elitist snots didn't you grasp?   

 You honestly (and people such as you) think that EVERYONE on the planet knows off hand what the hell "nom de guerre" means?  If so, you're actually DELUDED, not enlightened or educated.   WP is NOT just for PhD or high-minded readers, but for EVERYONE...and what is the big problem in simply parenthetically clarifying what a stuffy snobbish sounding expression like uh "nom de guerre" actually means?  What is the HARM in clarifying it a big briefly? 

 When people (who are uh "educated") use high-sounding language, it's NOT done for the benefit of the reader...but only so that the writer or speaker can strut down the street and say "hey look at me I talk smart." (Keith Olbmerann)   

 Anyway, it would be nice if you didn't think the universe revolved around your brain, thinking that JUST BECAUSE you and some other elitist types may know what that French phrase means (I know it, but I try to consider EVERYONE AND EVERYTHING...), does not mean that every casual reader may know that thing right away.   

 There have been criticisms hurled against Wikipedia (by writers, and educators, no less) that too many Wikipedia articles are WAY TOO DIFFICULT AND TOO TECHNICAL in language and style.   This crap of "nom de guerre" is just another little example of the problem. 
 So to answer your rude and stupid question "does anyone besides Art and Muscle think 'nom de guerre' needs to be defined, so and so"...obviously there is, since not every editor who has reviewed and looked over the article has felt the uptight need to remove the parenthetical clarification.   But guess what, ONLY A FEW have felt the need to remove it.   You being one.   Stop edit warring over this.  Only true vandalism, or opinion, or inaccuracies, should be "reverted" or "removed"...NOT good-faith clarifications or edits.    Bye...