Part of "using your brain" would be realizing that there are PLENTY of people that had no cosmetic issues whatsoever with the 5/5S. Sure, there are a handful of people on *gasp* an internet forum screaming "scuffgate" to high heaven, but I'll be darned if I didn't use my Slate 5 for over a year, naked, without a single scratch!
Do I agree that the 4/4S is slightly more resistant to cosmetic damage on a minor scale? Sure. Especially if you DON'T "use your brain" and treat it like someone who doesn't care about the cosmetics, only to bitch about it later when your keys/rocks/whatever else you put in your pocket scratches your phone.
The REASON Apple went to the more expensive design (and it is...) was NOT to prevent cosmetic damage, it was to lighten the phone and make it less succeptable to catastrophic damage from things like dropping or hitting the back with a hard object...
Does that bug the crap out of OCD people who can't sleep at night over a hairline scratch? Probably. But the great news is, there are ways you can use the phone NAKED and still keep it flawless, even with a 5/5S.
Provided you "use your brain" of course. Which admittedly is difficult for some.
Personally I'd much rather have a scratch or dent than a completely shattered side any day, but since there are people who honestly believe it will never happen to them I suppose the prevailing point here is that as long as you're careful the 5/5S can hold up just fine, even in spite of that ignorance...
Just "use your brain"