highlight utility skills (cleanse, interrupt, ...) when effective

[Jeeqbit]

As you said, stuns would highlight all the time against trash and knockback immunity would be up either a lot or all the time because it's useful in other situations such as preventing cast interruptions or applying slow. Stuns can make you a better tank by reducing damage in old content from ARR or HW (where tanks have less self-heals) or to stop large circle aoes cast by trash, but aren't necessary.

Knockback immunity isn't necessary, even in savage, where you can go to the very edge or the middle to resolve knockbacks the way they are intended (and usually indicated in the normal version). This is useful to remember, actually, in case you ever use it early by accident in savage. The only time that might be a problem in savage is if the mechanic immediately following it requires everyone to be in a certain position and everyone else decided not to get knocked back with you.

Except for Doom, debuff cleansing isn't necessary either but people will appreciate it, especially if it impacts their rotation. Most of the annoying versions of these debuffs happen in ARR or when you fail a mechanic. Esuna needs a target, so even if it's highlighted, will they understand who to use it on?

Interrupting casts is usually not necessary but appreciated. Too many casts in ARR are interruptable and the ones in Shadowbringers are mostly on dungeon trash that an average tank won't notice because they are surrounded by 20 other enemies.

They are all things that make you a better player if you use them but that a lot of players just won't use right even if you handhold them.

Stunnable/interruptable stuff share the same indicator if you look at the cast bar, if I'm correct.

Not correct. An enemy that allows interrupts does not necessarily allow stuns, but sometimes they do and this can be used to interrupt multiple casts until interrupt is available again (unless a White Mage is spamming Holy ).

[Dzian]

so much this the amount of times i see tanks adn dps with posion or paraliezy witch is Esunaable adn they are like nope just fight threw it. so in my book thee to way the flashy button as suggest here. or the paralieze effect make you unable to move or act for oh say 3 mins adn the posions dot damages in send of like 100ish is no 15% of hp. yeah i know it'll lead to wipes adn people dyeing but then maybe such things won't get over look as trivial

Thats because most of the time those effects are either super short duration or so weak they are barely noticable..

I cant tell you how many times ive clipped something landed myself with a 15-20 second paralysis and it's never procced or interupted my skills once.
and every posion I see is so weak even the passive hp regen is strong enough to counteract it. even in encounters where it can stack 3, 4, 6, poisons and it still barely dents a players hp.
it's an absolute waste of time casting esuna..

Anything that is potent enough to be dangerous doesnt need esuna anyway. You get caught in a poison splash that actually hurts. and the effect wears off the instant you step out of it.... imo it should stay on you until cleansed...

sadly no, not on bosses at least, maybe on trash mobs. that dungeon boss hermes has a cast which gives himself a dmgup buff. it is interruptable, but you cannot stun him/it.

Yeah but the damage up buff is so weak its barely even noticable. most tanks i see dont even bother interupting. either laziness or they just dont know.. but it makes no difference.

The problem lies with how forgiving and braindead simple the devs make everytrhing.. just makes everything pointless and promotes sheer laziness..

Except for Doom, debuff cleansing isn't necessary either.

Dooms a weird one anyway because there's no consistancy with it..
this doom is cleansable so needs an esuna.
this doom is also cleansable but esuna wont work. you need to do a full heal.
this doom the healers cant do F all you need to stand over there to cleanse it..