Then why wouldn't you know how the combat system functioned and why such a trait like that would exist, even for a DPS? I didn't know about it immediately because, as I answered right off the bat, I barely played SAM. That's like me asking you why you didn't know about Sneak Attack on NIN having a front position buffed effect. You still failed to justify anything on that trait proving "tank". Move on, just as I am.
My mistake on the DRG thing. Keep in mind though that, as I said, enmity reduction wasn't a common thing at all. DRG was pretty much the only one that had that. Also note that, as I said in an earlier post, SAM was not introduced until Zilart. The game had changed things by then. Zilart also introduced things like Dynamis, which is where the THF AF2 came from with the Enmity. Referencing original THF AF and comparing to gear that came out later for SAM when it released is... really reaching.
Realize that SAM was very powerful for good stretches of that game. They'd often steal agg from tanks if they went wild even without enmity+ gear. Subbing THF was a common practice outside of raid setups. Enmity in that game is not a strong argument for much, since they also used it as a punishment. It would explain why caster gear drops also had +enmity back then. It's the same risk vs reward system that explains why some gear have massive damage boosts, but huge hits to accuracy/def/stats. Hence, why I said that stats don't dictate much there to determine someones role. Some do, like DEF, but enmity is not exclusive to it. I mean crap man, THF had +shield and +parry on their AF pieces. Are they tanks!?
I'm arguing on the matter because your points have faults that work against you, but you don't seem to realize it. You can't pick and choose your arguments by ignoring factors that work against you. This is why I keep saying that it'll work for both sides equally, and I continuously state why that's the fact on the matter. Maybe I am talking to a wall on the matter, which isn't unusual when it comes to reasoning and inner workings.