Hi,
As far as we know,developers use some kind of DPS meter to measure damage/healing done as often they justify nerfing something in game as "Summoner was doing too much damage in this and that event compared to other jobs" or "Bard is too strong" etc. It has been asked by players to have DPS meter in game to measure our own performance.
For casual playing not knowing if you play your job well doesn't really matter but for end game one needs to figure out offensive/defensive and buff ability rotations, what food to use etc to meet Damage-Per-Second and Healing-Per-Second checks.
At the moment we have striking dummies in game, I presume for the purpose of working out one's rotations. But if you want to check if the "Thunder III > Raging Strikes > Fire x5 > Transpose >Blizzad III > Thunder III > Fire III >..." is better than "Thunder III > Raging Strikes > Fire x4 > Flare > Transpose >Blizzad III > Thunder III > Fire III >..." or any other subtle variation over the course of 5min or 10min battle against dummy, you have to do everything ON PAPER and CALCULATOR from either battle log, or recorded video, which is archaic. I hope we agree at this point.
Now, if you participate in an end game event, like Coil T5 and try to beat it for a month, testing among other things various job combinations, you have very little indication of your party performance beyond "oh, we reached rage timer and enemy's HP bar was somewhere in the 1/10 or 1/15 on my screen, but maybe more or less because I was too busy trying not to die to pay attention".
Now, as seeon in ToS and here explained by a nice GM:
http://i.imgur.com/eGZYUHD.jpg
Intercepting, collecting and mining game data using unauthorized software is against ToS.
I have few questions regarding that:
1) Does recording game video count as "intercepting/collecting game data"?
2) Is recording a video of your/party damage in the game against the ToS?
3) Which, or can be any, video software does count as 'authorised'?
4) Does copying your/party/alliance damage/healing from battle log for the purposes of calculating performance (by hand and paper or by use of algorithm on a website or executable program) against ToS?
5) Which, if any, 'parser' program is currently "Authorised"
6) When, and if, SE will be adding a built-in in game DPS meter?
I've heard people got warnings, maybe even bans for using parser to measure performance and complaining to other people that they are under-performing. For me this is very strange and unusual. I want to know my own performance without resorting to archaic means. I want to know my party's exact performance.
If I'm being told by someone that I'm under-performing, I want them to be able to back that claim with solid numbers, not gut feeling and prejudices from ignorance.
It's been in WoW for ten years (pretty much as long as FFXI existed) and in other mainstream MMO games, I'd expect parsing be allowed if not encouraged. Adding iLV score to the game was the step in the right direction, but it doesn't tell the whole story. As producer Yoshida said in regards to PvP gear, for example, skilful play versus bad play can nullify up to 20 iLv difference in gear.
Gut feeling is bad, knowing exactly how you've performed is good.