Defense may be too strong a term.
More and more as I brew my "starters" I batch sparge, mostly because I can ignore it a little more, and believe me, I tend to ignore my fly sparges,
My big beers, with approximately a half sack of grain for a 5 gallon batch, I have to fly sparge. There is no extra room.
I never see anyone talking about how easy fly sparging is. I often feel an urge to talk about it when I get a chance.