There's a difference if you want, but knowing that the base premise in a battle is that two teams (the "PCs" and the "monsters") are attacking each other until one slays the other, saying "don't attack my friends" is equivalent to saying "attack me" from where I'm standing. They're not starting from a standoff where everyone has the choice to attack or not; they're in a battle, the fighter, on his turn, moves in and marks his opponents. There is a difference in terminology to which I agree, but the end result is essentially the same.
Okay. So what? You have a party in which there is one guy in robes and one guy in full plate armor. They are collectively going to eat X attacks. By your reckoning, they cannot avoid eating X attacks. Why is it crazy and unrealistic that the guy in full plate armor tries to get most of those attacks to come at him instead of at the guy in robes?
When you put heavy infantry in front of the archers, this is the exact same strategy. Your army is going to eat X guys with pointy sticks charging you on horseback. You want those attacks to go at the folks with shields and breastplates and pointy sticks of their own, instead of at the guys in leather with bows. Sure, the heavy infantry don't have a Defender Aura, but physical positioning makes an adequate substitute.
Last edited: