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The second and last point you make? Namely "game play"? You don't get to 'cheat' yourself out of that. In first person mode, you're meant to be capable of seeing or 'expecting' a mob/add coming at you from behind/flanks. In third person mode, you're expected to be able to spot it even faster, because it runs faster, and hits relatively harder. You are also meant to spot it faster while simultaneously avoiding ground traps/hazards, keeping an eye for your shaman's ground AoEs, planning your escape route while taking that boulder blocking your way under consideration, etc etc.
I pulled this out specifically alone, because I find it confusing in the point you are making.
What does "
In first person mode, you're meant to be capable of seeing or 'expecting' a mob/add coming at you from behind/flanks." this mean? You are meant to be capable of it how? By turning around and looking constantly (that is what the game play part is, not being able to see everything at once, having to constantly look around, etc... ? I don't understand what you mean here.
So in 3rd person you are... supposed to do it faster? What does that mean? I gave you a visual example of how in first person, your visual range is limited, making you constantly shift and pay attention to your surroundings and because of this, your chance of having a mob rush up on you as you did not notice it is greatly increased. So you point about you are required to see it faster is odd. I know of no mobs running faster between the views in EQ and why would that make any difference? Not to mention, 3rd person allows a wide view often to the point where there is no "sneaking up" on a player. In fact, I have never had any issues of an add I didn't see due to the advantages a 3rd person view gives.
As for your "traps/hazards", well... you can do all of that in first person as well. In fact, it is a common form of play in most older shooters, specifically games like Portal and Half-life, so 3rd person didn't bring anything new to the game here.
This brings us back to what did 3rd person bring? Well.. it brought the ability to see behind you and completely around you. It provided a much easier means to judge spacial relationship between obstacles (ie where am I in direct relation to that obstacle/trap/hazard), it provided a means to see around corners, etc...
Nope, not cheats at all.. it is... as you said "a preference", I mean... just as lets say the guy who likes to buy their items in a RMT store so they can circumvent game play is, you know... just a preference. /boggle
edit:
I want to be clear here. I do understand the point you are trying to get at concerning 3rd person and how it can have game play elements added to the game that directly attend and require that form of view, but honestly... I don't think there are many examples out there that really are trying to stress the game play in that view.
I think most developers don't even think about it and even if there turns out to be something that ends up working as such, it is often by accident. Like I said, everything you mentioned has been done with first person, 3rd person merely makes it easier.
I think you would really have to put some extreme thought to make 3rd person more of a game play element than what you can already do with first person. Fact is, 3rd person is predominately used a "preference" such as you mentioned, but one that serves convenience, not game play in most games.