Cute strawman. That addresses all of nothing I've said though, but that's to be expected. You aren't interested in having other players climb to get to your level, you just said so yourself: "Figuring out basic job rotation to deal damage is something you do before you queue up or join PF. Learning the fight mechanics is something you do before you queue up or join PF." Your argument is so short sighted and filled with logical holes that we should still be waiting on World First clears of the story dungeons if reality was actually reflective of your beliefs. After all, someone has to go into a fight perfectly blind.
Let's look at this from a purely objective perspective. A player does not get his full suite of abilities until level 50, and has to make due trying to optimize a slowly growing stable of abilities for literally most of their formative experience. This means that a parser only has value in the post game, as before then the lack of abilities makes optimizing DPS a simple math problem. Except endgame dungeons get complex quickly compared to what comes before in massive contrast. Especially when in consideration to the ever changing stable of people you play with. When you actually think about how the tempo of each fight plays out, you quickly realize that there is no "basic rotation". The "default Ninja opener" for example is worthless against Garuda and Titan EX because they have such an early phase transition that will push you out of it. With this in mind our objective perspective shows us that there isn't a "basic" rotation, there is a heuristic logic to an ability's timing. This means that a parser is logically even more necessary to optimizing the fight, because the changing nature of the fight and the timing of when bosses become immune to DoTs or damage alters the "weights" of each ability for that fight.
But looking at your statement, this is impossible. Experimentation is verboten, the "rotation" is sacrosanct. "Figuring out basic job rotation to deal damage is something you do before you queue up or join PF." Ergo, it doesn't matter if a parser exists or not, it's effect in the face of this statement is the same either way; nothing.