You see the mobs on your radar, that is what a radar is for. That icon takes away excitement exploring as you already know that the mob is not agro, you proceed without caution...
Also the current icon looks like a sun, it makes all agro mobs look like want to hug and cuddle you.
...
You PLAY the games, you do not LOOK the games up somewhere if you ant to review the difficulties and discuss game mechanics.
You need to experience the thing first hand. All you know about FFXIV is what you read and see on screenshots or youtube, that is not quiet the same.