This actually just proves his point.
You are playing right into SE's hands and you have no idea just how much sh!t this RDM SP2 actually is regardless of system changes. Since I know you mean well, I'll break it down for you.
This post tries to state the difference between Elemental Seal and RDM SP2, but you and I both know that in reality, they really are just the same thing. The one difference they have (outside of duration), is that the SP2 is a guarantee to land. This means that no matter how resistant the mob is (barring immunity), the spell will land regardless of your statistical deficiencies.
But there's two things to notice here:
1: The RDM SP2 does not enhance the potency of the enfeebling spell. All it does is guarantee that the spell will land.
2: They are making sweeping changes to negate immunity to multiple NMs.
#2 is extremely important, because if mobs are no longer able to just go "lolimmune" to a RDM's enfeebles, that means RDM will be able to land enfeebles normally without the help of MAcc+ JA's.
But the next question would be, "what if they don't make them immune, but so resistant that you would need to use MAcc+ JA's for them to work anyway"? Then we're back to where we started and nothing has changed at all. RDM still has crappy enfeebles they can't land without riding on Immunobreak, and since Elemental Seal is on a 10 minute timer and has a massive MAcc buff, people will op to use that over the RDM SP2.
Ah, but here's the last question, "What if they make them so resistant that not even Elemental Seal would work?"
Then they are immune.
This may sound silly at first, maybe absurd. But it makes perfect sense if you sit back and think about it. If you make them so resistant that only a 1 hour JA can break that resistance, then SE ends up doing the very same thing that they stated was a mistake on their test servers, that RDM SP2 cannot break immunity. But if you make it so that only the RDM SP2 can land an enfeeble immediately (changing 100% resistance to 99% resistance), then the mob is considered immune, and the SP2 just happens to break that rule.
You see the problem here? In order for the RDM SP2 to considered useful, they either have to jack up monster resistances to such high levels that not even Elemental Seal can break it, or the RDM would have to be so gimped in gear and skill that the SP2 would be the only way for them to land an enfeeble. The former just makes RDM more useless than it already is. The latter only makes the SP2 a crutch until the RDM gets better MAcc. Either way, one of two extremes have to happen to make the SP2 look useful, and neither extremes help RDM in any way possible.