I would like "Killer" traits return

[Shurrikhan]

I'm not sure what you're saying here. It looks like you're agreeing and disagreeing at the same time.

I'll try to be more clear then. I believe that elements differentiating only for element's sake (i.e. by name) have no real advantage. If all elements differentiate within a shared range of under-mechanics, then I believe the elemental wheel has a chance to work. Where one type beats another as a matter of general law, rather than through the particular undermechanics (preferably also with the possibility to still use an element against its resistant (and/or own) type by combination with other elements), I find that gameplay is only simplified and offset, and muddied in endgame content, even if a bit more interesting during leveling processes (unless that process too, is taken with full seriousness/opportunism/efficiency-seeking/etc.).

I like a system in which Fire still works against Ifrit, earth against Titan, and wind against Garuda -- but with dependency on how you use it, and possibly with risk even of absorption at times.

While this changes a lot when I hit Lvl.50, it's still bothersome that it makes no difference if I know nothing about my target other than that they do X AoE ability that I have to dodge. It makes a lot of enemies feel like damage sponges, especially as BLM.

This is sadly the case for all classes, even if a bit more noticeable on a turret class like BLM. Which is partly why I'm personally not putting much stock into DoM system revisions (elemental wheel) without melee and tank interactions also being looked into. That said, I don't think any of that will happen.