I feel part of the divide stems from the fact one faction is talking about Encounter Design and how a player interfaces with that encounter with their job and another is talking purely about Core Job Design without consideration for Encounter Design.

It goes without saying that when you compare kits some jobs have an easier time doing their core function than others and there are some complexities between roles. IE Healers can do their core job just by hitting Cure / Benefic / Physick on whomever is injured but melee DPS have to perform combos that have positional requirements and also have buff maintenance up time that is part of their core DPS kit.

Once you slot individual jobs into a specific encounter than those jobs have to start optimizing for those particular fights where players have to start considering fight mechanics and the "how" and "when" to use their cooldowns and abilities to maximize their output for the fight. Everyone has to do this. But this doesn't change the core knowledge each player has to have of their job, which is different from job to job and either simpler or more complex depending on the comparisons.