Can we use ACT to recognize who is griefing the party and report them afterwards?

[Curisu]

If you see someone dealing no dmg then you can just look in-game what they are doing.

Caster are especially easy to figure out why they deal so much less dmg.
Give them advice in what they could improve.
If they continue to play like a bot or even get offensive then you have a reason to yeet them out of your group.

You don't need a 3rd party tool to proof that someone is not playing correctly. But it helps to faster identify the reason to why everything dies so slow.

[Karl0217]

If you see someone dealing no dmg then you can just look in-game what they are doing.

Caster are especially easy to figure out why they deal so much less dmg.
Give them advice in what they could improve.
If they continue to play like a bot or even get offensive then you have a reason to yeet them out of your group.

You don't need a 3rd party tool to proof that someone is not playing correctly. But it helps to faster identify the reason to why everything dies so slow.

Yep. Got into the Copied Factory one day on the roulette as a dragoon and had another dragoon in the party in full savage gear, had about 10,000 HP more then I did. About halfway through the first boss I glanced up at the party list and saw I was number two on the aggro and they were dead last on the aggro. I thought this was odd so I started watching them and saw they were just auto-attacking.

Dancers not using steps or picking partners. Dragoons not using jump attacks. Red Mages ignoring their melee combo. Paladin not using off-cooldowns like Spirits Within or Circle of Scorn. Party members not using their AoE combos on mass pulls. All this stuff is easy to spot without the need of third-party software. Good damage output will follow naturally from knowing your class's toolkit and rotation, having decent gear and knowing enough about the fight mechanics to avoid getting knocked out.