I like think of the games fight mechanics as a distraction economy. Everyone shares one part of it. The mechanics of the fight.

Tanks tend to have simpler rotations because they need to avoid damage more, think about timing mitigation CDs and positioning the target optimally.

Healers have simpler rotations because they are watching the health of the tank. Looking for emergency healing among the party and and also fulfilling support roles.

Physical Ranged have longer more complicated fast paced rotational strings that require more focus and situational support roles because of their relaxed mobility.

Magic Ranged deal with casting lock and maintaining buff and dot uptime but get a less complicated though still nuanced rotation. So they need to manage optimal positioning more.

Melee have very strict combo systems but mostly stick to nailing ogcds and move around alot for positional attacks to get the most out of their rotations.

Of course there are hybrids in between, but I think SE did a great job with balancing the distraction economy in the game and gave every class a fair balance of stress. Now where this diverges is what of these systems works best for you to play at your best. Everyone is different. Some people like hitting skills when they glow, others like to follow the dotted line and do same sequence over and over, others like to hit the right skill at the right time, or maintain uptime of skills.

There is something for everyone and in between.