They don't need to spend a ton of development time making talent trees or anything, they just need to implement a better skill ceiling gradient in the current jobs. 99% of humans are entirely capable of learning and maximizing BLM for example, just 98% don't want to whether they're too lazy, or don't like casting, or whatever other reason. For example complaints like this:

Quote Originally Posted by Raikai View Post
I don't like that statement just as blunt. It sucks if you really LOVE a job's aesthetics and fantasy but can't play because the skill floor is too high, let alone the ceiling.

In the ideal world (in my opinion), every job's skill floor should be accessible, with the full potential under a medium to high skill ceiling, and the final rdps being (mostly) dictated by that... Makes sense that a very high skill ceiling is rewarded with better dps, and that's why I like BLM. The actual job is quite simplistic, however I feel that BLM is the hardest job to play because you basically have a separate high skill ceiling for every fight, since your performance is ultimately dependent on knowing when is what.
This individual does a good job pointing out BLM as an ideal floor-ceiling gap for a complex-leaning job. However..."can't" play a job because its skill floor is too high? What job has ever been prohibitively difficult for a normally functioning human being? I could accept "I like this job fantasy, but don't want to put in the effort to learn it because it's too hard" because then at least the complaint is honest. Of course my response could easily be: are you playing EX or above? No? Congratulations your performance literally doesn't matter (for dps/tanks, it matters essentially only for healers and the collective party these days).

Even if reaching the ceiling is important to casual players, why should they get to dictate it universally? Why should players who want a job they can put a lot of time into improving be cast aside entirely? The obvious answer is they shouldn't. More jobs should just be designed better. Unfortunately only BLM seems to get this privilege.