in 1.0, we have 4 type of mob aggro: sight, sound, true sight, and true sound. It sure was really thrilling when we're trying to tag faraway aether which has lvl 80-99 mob with true aggro & sight camping around that aether, even sometimes need to ask a friend to sacrifice him/her, so that I can pass through to reach it. lol
Now in ARR, we only have 1:
sight. You can just literally run or even bumped their back, and they wouldn't give a shit.

oh... we do also have sound aggro, but they're only in dungeons. lol
in 1.0, we have mob as high as lvl 99. It sure heck as fun when we always had to walk around aggro sound- lvl 99 Treant to reach King Mog battle entrance. lol
Now? only max lvl 50 mob. And they even hit like a dairy too. lol
So... what's the point? lol