
Originally Posted by
Packetdancer
None of the tools are required for the fight. And, in truth, a parser isn't going to help with the fight. But it can be extremely valuable for analyzing where a fight went wrong.
If you are consistently hitting enrage on a fight -- i.e., you did not do enough damage to the boss to kill it in the time allotted for a pull -- then somewhere, the damage isn't adding up. Now, often this can be people screwing up mechanics; a damage down debuff for failing a mechanic means, unsurprisingly, that you do less damage, and if you didn't get a damage down and just died... well, dead players do no damage (and rezzed players do less damage).
But if you aren't having deaths and you're still hitting enrage, you need more damage from somewhere. Maybe everyone in the party is a bit below-par on DPS, and if one or two people really pick up their game they can make up for that. Maybe the party is mostly doing average/acceptable DPS, but there's one person who's barely moving the needle on their DPS meter at all. Not only can a log as generated by something like ACT help figure out "okay, why don't we have the damage for enrage?", it can also be put into a timeline analyzer that can say things like "this player is blowing their burst phase outside of where all the raid buffs are aligned; shifting it two seconds later will give a measurable increase in their DPS".
When I wanted to improve as a player in endgame content, it was absolutely invaluable to be able not only to feed my logs into an analysis tool like that to see what I was doing wrong, but to compare my logs with some of the top parses for folks playing the same job. I could see "Oh, they're doing this... I wonder why..." and then look at it more and then some nuance of how my job and that fight's timeline interacted would become clear. And I'd do that much better on my next run.
So, they aren't necessary to perform the fight, but they can sure be really useful to look at a fight afterwards and go "Okay, but... why didn't we clear?" or "Okay, how can we do better next time?"