Astral Fire/Umbral Ice timers are actually bad mechanics at a meta level.

[Rongway]

At some point you have to ask, "Does taking this away add anything?" And judging by the hoops Rongway jumped through to get it to work without it, I'd say no

I think one of Taranok's major points though is that making UI and AF persist until zone/death would change nothing for the top 15% BLM players, but BLMs in the lower percentiles would have a smoother time, enough that they're not severely punished for being half a second too late on a midphase Fire cast, but the lower percentile players would still have enough other aspects of the job (continuous GCDs, preemptive choreography, the MP dance) to improve on.

I must have done a bad job of explaining my interpretation of the suggested mechanical changes if it sounded like I was jumping through hoops? Applying edit to previous post.