"Oh my god Kayle is too sexy now, she has boobs on her armour!"
http://images5.alphacoders.com/347/347692.jpg
Asides from having a dynamic pose rather than a boring static statue pose. More adequate texturing. A shield of liquid light (R). And more importantly, a perspective of a man staring up at a descending armored angel. NOTHING CHANGED ABOUT HER ARMOUR.
Boobs are impractical and unrealistic
Yes, and so is the very idea of a woman being in the battlefield if you consider Kayle's inspirational origin. Let alone wearing armour and fighting, you'd have a hard time finding many women who were bare-foot and staying in either brothels or at home taking care of wife-stuff or preparing dinner for guests their husbands may or may not bring over.
That armour is unrealistic because it has boobs
Indeed it is. The very idea of her wearing armour is unrealistic to begin with. If you want to climb this branch, double the size of her wings, give her an extra pair for good measure, and replace that armour with silk or something.
But you people accept the idea of a winged woman with a flaming sword covered in liquefied light wearing armour don't you? But you have a problem with her armour showing extremely subtle boob-bumps that's always been part of her design, that's pretty selective discrimination of details there.
Look, her armour design did not change at all. Her boobs are TINY, smaller than 
! There's a million things going on in that splash art. She's a woman covered in liquid holy light or whatever. She has huge-ass wings. Her boobs are hardly the focus of the splash art.
The ONLY reason people are even noticing the boobs then is because they are **specifically seeking it out. **
Historically speaking, one of the most well-known female figure that's been anywhere near the heat of battle have been Jean, the little girl who proceeded to get thoroughly destroyed, captured, and burned at the stake, or Athena, who atleast carries weapons and didn't get humiliatingly defeated. And what is, bar none, THE most widely accepted depiction of Athena again?
http://media-cache-cd0.pinimg.com/736x/3f/d9/e1/3fd9e1f9809f8b90da83ce6a0e221e72.jpg
It's true that she isn't wearing boob-armour. But that is only because she isn't wearing any armour, period. Is it impractical in a real battle? Probably...but the whole, being a divine being thing probably had a lot to do with it.
