I'm still not too happy with how Black Mage is currently. Upon thorough analysis, just about every change was detrimental to the job. The few that aren't are the changes to Manafont, the third Polyglot stack, Retrace, and new Umbral Soul. Those are fine to stay.
Paradox being made instant in Fire Phase is much more of an issue than most people understand. In Endwalker, you had just enough time to get four FireIVs off, then Paradox in the first half of your fire phase. Alternatively, you could also get off four FireIVs after Paradox and still get your Despair cast off. I actually tested this personally at base spell speed, 2.50 GCD and everything. It felt balanced. You had an equal amount of time in each half of your phase, and that made both halves feel equally meaningful.
Now compare it to Dawntrail. Paradox is instant now, so that means your enochian timer is starting right when you hit the button, not when you finish the GCD. You can now only get three FireIVs after Paradox while still getting Despair off, but because of FireIV's slightly longer than base GCD cast time, you still only get four FireIVs in the first half. You can actually manage to get five GCDs off before Paradox if two of them are instant cast. (also, this doesn't work if you use the instant Fire 3 to swap phases) It makes high spell speed feel almost mandatory now.
It cuts down heavily on your options for the only benefit of an extra Movement GCD that we don't even need. Ask yourself how often you use Xenoglossies or Triplecast to keep them from overcapping. For me, it's all the damn time, even in Savage.
Additionally, it muddies the amount of information you can actually get from the gauge. Notice how the gauge starts at 15, and ends at 1. It never actually reaches 0 before it fully ends. This means it rounds up to the nearest whole number.
If you're like me, you don't really plan out rotations as much as you play it by ear moment to moment. How do you know if you have enough for that last FireIV before your next Paradox or Despair? In Endwalker, doing FireIV and Paradox would be 5.3 seconds total. If you've got enough time for this, it'd show up as a 6. Slidecasting rules also apply, so depending on your latency, you can be certain that you'll get the last FireIV and Paradox out as long as the timer says 6. If not, then add more spell speed to the desired value. It's actually a pretty similar situation for Despair, just with a bit of extra time needed.
Compare this now. You've got a timer that says 3. It could be 2.9 in which case, you're good to go, or it could be 2.3 where you absolutely shouldn't try it. The only way to know for certain is to wait for the timer to tick down, or have a perfect internal memory of what fraction of a second has passed since the last second tick. Early on especially, this led me to taking a lot more risks on numbers that seemed like they would work only to lose enochian. Now it's leading to me being way too safe with my timer, and forcing myself into this very rigid rotation where I'll hit paradox if it's anywhere less than 4.
This sounds like a skill issue, and not an issue with the class. Maybe I didn't explain it properly, but my point is that the game guided you to knowing exactly what information you needed with the job gauge, and now its imprecision is causing issues that weren't there before.
That's not even to mention the levelsyncing experience. This was the number 1 thing I wanted fixed about Black Mage going into Dawntrail. The fact that Flare and Despair are different buttons given so far apart means that I outright refused to do anything levelsynced so I don't go below 72. Now because of how used to Paradox being instant I am now after Extreme and Savage, I refuse to levelsync below 90. I went from having 19 available levels to only having 11. Good job Square.
All these huge issues stemming from just a single change of cast time.
I want to keep ranting on everything that bothers me, because it's genuinely a lot. But I feel like this post shows in enough detail just how much I think about this class, and how much contempt I have for these changes seemingly made by someone who just doesn't understand what makes Black Mage fun to begin with. (Achievement: most pretentious thing said all day.)