Black mages entire identity and difficulty comes from having to manage the timer of astral fire and positioning proactively instead of as a reaction. In the live letter, black mage had partial casts and no astral fire timer to manage, essentially removing the core play style of the job.
Not every job needs to be played by every one and the only way to make every job playable by anyone is to make them all the same. The difficulty in managing timers and having long casts is what makes black mage fun for the people who play it. People want to have difficult jobs and be able to improve instead of press a single gcd without possibility for failure.
Players are tired of jobs being simplified and turned into gen/spend playstyles. Let us keep our timers and the difficulty that makes black mage fun.