I have been playing MMOs since 99. I started with Sonys Everquest. Aggro was pretty straight forward in that game. If you out damaged the Tank you caught the ire of the mob. If you had low Hit Points you also drew extra attention. If you cast to much healing to early...etc. But there was always a reasonable reason.
Also in video games, Im not sure about ESO, there is something called LOS (line of sight). I notice if I'm am grouped, say, in a 2 player group and I am foraging something and my partner aggros an enemy the mob will run right passed them and come for me. Out of caves, around rocks, down mountains, it doesn't matter they will come right after me. Even when I am NOT visible due to LOS. Why does this happen? How does the agro work?
Same with combat I can be killing a world boss with many other players much higher levels than I and the named will turn and come right after me. Is it low HP agro? are my base HPs too low?
Also in regards to LOS How do enemy fireballs and other missile weapons seem to penetrate solid objects? They almost seem to be "homing" weapons? I notice a curve in the arc of my bow projectiles but not through walls.
I understand this is more of an arcade style button masher game rather than a know your class or the group will die dynamic but what gives..?

PS I used the search engine and like most forum search engines I found Bupkis.