I've trully have the feeling that's what some people call "more complex" appears to me as "more broken".
-> About healer, Scholar was as off healer in ARR, because it only have a healing pet and 5 different skills from Sumoner, and Lustrate was a fix max HP heal to make it usable with cleric stance (if I remember right)
-> I don't think having 3 combo path to be that different from having just 1, for warrior using Storm Eye, Storm Path, Butcher Block over and over is not more complex than just having between Storm Eye and Path.
-> Back in HW Warrior have the feeling it was supposed to be some kind of OT, has he got very poor magic mitigation (it's 1st defensive ability was a def boost, and could be catch by others, and the second one was bloodbath as self sustain). I would also say Raw Intuition was extremely broked as Parry only work on physical dommage, and it's not like Camouflage which got a basic dommage reduction effect.
-> At the beginning, DRK got shadow shield, which was just a rempart with different name. I would love to have each tank having it's own version of rempart with side bonus, however i can understand it's extremely low on priority.

In a nutshell, to me, jobs were neither hard or complex back in time. Different for sure, but harder to play/execute ? Not to me.