How? Brainpower is brainpower. Humans suck at multitasking.
		
		
	 
Nope.
	
	
		
		
			No, but you may well be thinking about your attack bonus and which feat to use  (orcs), or your social skills and relevant powers (the princess). Lots  of people have observed players in 3E and 4E developing a kind of tunnel  vision, seeing everything through the lens of powers and skills and  feats, and ignoring the possibility of stepping outside what's written  on the character sheet. That happens because it takes so much thought to  sort through a PC's mechanical options that non-mechanical options get overlooked.
		
		
	 
So you've never described an attack after making the roll, I take it?  Because you're claiming that it's 
physically impossible to do both.
That's very obviously rubbish.
For that matter, are you going to seriously tell me that earlier editions didn't have 
attack bonuses?
	
	
		
		
			If you're playing a fighter with Intelligence 8 (not unlikely  if you're going the turnip farmer route), every skill point counts.  It's not going to cripple you in combat, but you'll certainly feel the  lack when your Climb or Swim skill suffers as a result.
		
		
	 
That's ok, the wizard can cast a level 1 or level 2 spell to utterly eliminate the need for Climb or Swim 
	
	
		
		
			In 4E, there most certainly is such a thing as a non-advantageous  background. For instance, Wisdom clerics have a strong incentive to  pick a background that gives them Perception as a class skill;  Perception is a massively useful skill, it keys off the cleric's prime  stat, and by taking the appropriate background you can save yourself a  feat on skill training. Picking a different background won't break your  character, but it'll cost you either a feat or a valuable skill, which  isn't negligible.
		
		
	 
No and no.
Clerics do not 
require perception.  Is perception nice?  Of  course!  Is it a class skill?  No.  Is it needed?  No.  Are any cleric  abilities tied to perception?  No.  Can you make a really awesome cleric  without ever touching perception?  Yes.  
Have you played 4e?
	
	
		
		
			Either way, the system sets up incentives to put the  mechanics first and contort your character's back story and persona to  fit. All of D&D does that to some degree, of course--it's hard to  justify being a professional scholar with an Int of 8, in any  edition--but the more incentives there are and the more detailed their  interactions, the stronger the pressure.
		
		
	 
Only if you want it to.  In fact, at least with 4e, it's the  goddamn opposite - the reason classes are generally "fluff-less" bags of  mechanics is because you're meant to make the character first and then  choose which bag of mechanics fits it best.  You're essentially telling  us to stop putting the horse before the buggy.
	
	
		
		
			I can show those things in 1E and 2E as well, and much more  easily. In the little space on the character sheet where it says  "Character History" or "Background" or whatever, I write, "Turnip  farmer." Done. I don't see why you're hung up on needing mechanics to  detail every little thing about your PC. Do you need to pull out the  Book of Erotic Fantasy to state whether your character is straight or  gay?
		
		
	 
Stop being obtuse.  Nobody is hung up on mechanics - nobody but you, that is.  Some people prefer having a 
mechanical basis  to show that their character is different.  I can make Fighter X and  Fighter Y and point at their differences that effect the in game rule  system and say "look, these two are seperate, unique characters."
	
	
		
		
			For all their flaws, and they have many, 1E and 2E recognize that  you can create two totally different, distinct, and interesting  characters with exactly identical stats. Or at least I can.
		
		
	 
You can, the game cannot.  That's the thing.  You can write whatever you  want under background.  You can write "My fighter is actually Superman  and Goku's baby who then was teleported into the D&D universe" if  you so desire.  And guess what?  
It would be just as valid as any other fighter.
	
		
	
	
		
		
			Have you not heard the saying, "Experience builds character"?
Are you not acquainted with the meanings of the words in normal English, as opposed to D&D-geek-ish?
		
		
	 
Between the hilariously lame insults, smug usage of needless obtuse language, and the goalpost moving, playing soccer with you must be the most nightmarish experience possible.
	
		
	
	
		
		
			We're not going to get far here, as there's a  pretty big gap between how you define a character and how I do.
It seems there are two definitions (let's assume same class and race, for the moment):
1. Character as mechanics - the character is defined by its numbers and  abilities, with personality and background somewhat secondary and-or  irrelevant unless somehow reflected in the mechanics.
2. Character as character - the character is defined by its personality  and background, with mechanics and numbers somewhat secondary where  relevant at all.
		
		
	 
Playing D&D with you must be the most frustrating thing imaginable if you honestly think those two are somehow seperate.
"I attack the orc!  I raise my longsword and - "
"Whoh whoh, don't describe it man.  I need to know how much damage you do.  You can't do both things at once."
	
	
		
		
			You (and 3e, and to some extent 4e) clearly go for the first definition.   I (and 0-1e and to some extent 2e) prefer the second.
		
		
	 
No, 
good players do both, and 
bad players try to set up dichotomies and make others "choose."
Incidentally, bad players typically brag about being able to do one, and in reality are just terrible at both.