On the usage of Trick Attack by certain jobs, SGE wouldn't burn Toxikon II as it has equal potency to their filler, it's Phlegma III that they would burn under Trick Attack, and they should have at least one for every application. For AST, Earthly Star happens to also have a cooldown of 60s, which lines up well. For BRD, they generate enough gauge for an Apex/Blast Arrow for every Trick Attack application.

Small corrections aside, I agree with OP, Trick Attack was a valuable resource for every job, not just the ninja, removing it made no sense and also made gameplay more boring to optimise.