Really? BLM is one of the jobs that most frequently gets cited in terms of developer bias, especially because of its association as Yoshi-p's main. There was even a public apology statement in 6.1 and response from the Producer regarding BLM's PvP balance because the dev team were called out on blatant favoritism. That's the one job that they have to be the most careful about public perception, and casters would benefit tremendously if Pictomancer displaces BLM even if only for a single expansion.

Public perceptions about job complexity have more to do with how many people are playing a job rather than any objective measure of gameplay. A popular job is going to tend to be perceived as more complex, simply because perceived depth correlates with time played. Even WAR was lauded as 'the most complex tank' for a time in Stormblood. It wasn't actually, but you had a vocal playerbase insisting that it was. I would take any claims made about job complexity with a grain of salt. It all comes out in the wash anyways if you balance based on averages, and a mediocre player playing a theoretically mechanically complex job doesn't deserve to do additional damage purely based on job selection.