I know they are becomming more common but I still don't think they are totally the norm. Maybe they are where you live though--so I stand corrected. Wow! That is amazing to me. In my life the vast majority of mothers I know (or have kown thoughout 6 states and 2 countries) assume someday their DDs will shave their legs but I have never known a one who assumes someday her DD will have a nose job. A few would not mind if their DDs did want a nose job, but it is not a foregone conclusion the way leg shaving tends to be.
To me "deviated septum" is not about appearance (though it can have that side effect) but about better health and comfort. Much the same way that braces can be just for prettier teeth but can also be because of true health/comfort issues such as a misaleigned jaw (after I had braces the headaches I had battled for years went away) or my DD's issue ion which she has a tooth come nearly an inch behind the others putting it close to the center of her mouth--not easy or comfortable to eat or talk with--the braces will correct a jaw issue and slowly drag that tooth in line with the others (after she had surgery to turn the tooth as it was also pointing baout 90 derees off and threatening to damage nerves and possibly bone

). There will be a cosmetic effect from teh braces but it is not their primary purpose.