Game Design as a whole is simple. They have taken away any game design that was even remotely interesting with shadowbringers.
Tanks has infinite aggro now nobody can steal the aggro from a tank
Healers have infinite MP
Dpses lost all interesting debuffs and buffs. Now everything is damage based.
You have the rare occasion a tank needs to interject an ability once or twice a raid
Slashing Piercing and bludegion damage no longer matter
Any customization of stats are gone. Cant meld main stats onto your gear.
Every raid follows a basic formula it minorly changes per raid but generally they all follow the same formulas

Making healing interesting would require the devs to actually put some effort into changing there raid formulas. Which we all know the dev team is lazy and Yoshi P will always use the excuse balancing healing is hard. Well balancing Healing is hard because you designed the entire game to always keep your party at full hp and needing to full heal them within 10 seconds.and every fight is a dps check so healer damage is still needed