Cactbot can be scripted to provide logical solutions based on a variety of tells that it can gather via network packets, sometimes before the mechanic is even visible client-side.
This isn't simply telling you what your debuff is; It's reading both the placement of the lasers AND your debuff, and then telling you where to pilot your character.
Here it is reading two peoples debuffs and making a decisions about Nisi.
Here it is instantly reading the coordinates where un-targetable actors spawn, then telling you exactly where and when to stand on a plugin-compatible marker set. It even used to be able to place the markers for you dynamically in combat, before the new marker system was rolled out

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In P3S it can call the plumes 4-5 seconds before they appear on screen, due to it using the same code as Cruise Chasers Optical Sight.
In the EW final trial it can instantly determine where the safespot from the large aoes are by reading actor coordinates as they spawn.
Again, the source-code for this plugin is public and I have read large portions of it. I could pull out examples all day where it's applying logic in lieu of the player, sometimes by reading tells that aren't even visible to the player yet. Just because it doesn't support a few fights well, doesn't mean it can't offer blatant shortcuts in others. And it does all of this instantly, and without making mistakes.