Which may be fundamentally insane, but is nonetheless internally organized through and through according to a given principle: evocation. Explain it how you will—feeding one's mana pool by releasing vacant, unheated matter, while spending one's own internal energy to create immense heat around the target, or whatever other idea—but it's consistent throughout the spell system. It might not be the most fun take on an internal system ever, or make use of all that BLMs skills, even in just this game, could have going for it, but it is coherent.
? The only other example of THM we have is also from XIV, in which it was a sort of Shadow Priest-ish spiritualist, sacrificing its own health for a heal and HoT, applying on-hit-taken defensive buffs, and having really rather strong Poison/Umbral/Astral abilities in the form of Scourge, Banish, Bio, Dia, etc. Do you mean simply that it didn't evolve much, or still feels 90% how it already did? I would argue it didn't have to, even while providing as much new tips and tricks as the other jobs. Its niche didn't adjust much, but it's hard to do that to a pure caster class, and they do explain their take on the ancient magic systems that advance you to Flare and Freeze (and eventually Fire IV and Blizzard IV) in a way that, at least to me, worked, even if not... wholly capitalized on (and I don't know how that would be done).
What would those advancements need to entail to actually feel like a BLM to you?
To be clear, I think BLM could be better. I think it could encompass many more playstyles, even without the need for specializations, with varying difficulties and pay-offs (such that, a perfect player would stand out from others when using the hardest, optimal playstyle, but not by any huge amount, but with enough payoff that a fairly skilled player would be unlikely ever to fall more than a little behind the easier playstyles when having some extra troubles while learning a fight due to the added difficulties of the hardest playstyle). I think it could cover a larger aesthetic and leniency range, attracting more players to the job. But I don't want to see things just tossed in, breaking up its concepts or gameflow, just because those things existed in other, totally separate iterations.
To briefly go back to my original reply as to Frizze's list of abilities, I don't think anything that grand (as Break, Comet, Warp, etc.) should exist at the same layer or access as your more typical, mundane, or rotational spells. I could understand *some* of them making their way into a customizable LB system or the like, or if a new personal (PvE) LB system came about, but otherwise even those that aren't already taken or fall outside of the BLM range of elements don't seem like they'd have any place in the game.