I think there are a lot of different aspects to what constitutes difficulty, so there's going to be a degree of subjectivity for everyone.

And all this nonwithstanding, it also doesn't preclude SE making the conscious decision to make certain jobs more accessible on purpose anyway. With reaper, sage, viper, and picto (especially picto), we're now 4/4 for jobs released in recent expansions being fairly well received on that front. It's definitely a deliberate decision on their part.

There was actually a decent discussion about metrics like that just yesterday over here, it's worth a skim if you're curious and have 15 minutes.