Yeah but Mr.
Zenrot desperately wanted justification as to why it shouldnt be nerfed
I don't desperately want justification for anything, I just think a communities job is to discuss things and point out flaws/ways other players can better themselves/their tools instead of crying and hating on everything and everyone.
For instance, your analysis of Aquaman's trait:
Partially correct, you cannot do it on reaction, but you rarely need to. Matches like GA and Batgirl have points in time where you simply should put trait on wether you actually end up blocking or not, because it protects you in the instance you end up not blocking. If you're in a D1 war with Green Arrow or you see the mixup coming, trait and then try to block. Did you block the mixup? Congrats, keep playing. Did you get hit? It's okay, you aren't getting combo'd. Batgirl is a similar principle.
Killer Frost is irrelevant because she devalidates trait anyway.
Edit: Elaborating a bit more
The 8 second cooldown time facilitates trait usage in this style simply because Aquaman's buttons are so good that 8 seconds is not a terribly long time to not get hit. Extending the cooldown time to 1 use per 14 seconds (we'll say 14 since Pig's range was between 12-16 seconds), trait becomes harder to use this way and increases the list of characters that can more easily work around the tool. Batgirl remains more or less unchanged, considering the character actually has workarounds to Aquaman's trait in a lot of situations but the main one (negating Vortex) is something she just has to deal with. Green Arrow would benefit from less pre-emptive traiting.
Although I'd like to see people actually try to work around the trait more instead of getting their b3's blocked after ice breath and calling foul. There are characters that blatantly devalidate our trait (ex. Killer Frost), Can easily work around the trait but have to alter their game-plan a little bit in order to accommodate (ex. Green Lantern), and characters that just have to hold that and can do absolutely nothing about it (ex. Harley Quinn).