The issue is a personal parse will never work because it will never tell you enough information to male an accurate judgement.
In 8 man content for example the basic composition of the other 7 people in the party have a very significant impact on your "personal dps" how a ninja uses trick attack can make a big difference to your drg dps.
How an brd uses song or an ast uses cards also have a major impact on your dps. How and where a tank positions a boss can again have a major impact on your dps. Sus ex for example when tanks have the boss away from the crack adds up to tons of lost gcds when melee have to cross sides with the lightning markers. Or in o1s where that boss is placed can determine if 3 melee dpscan squeeze around it or just 2 without overlapping circles. Similar thing in o2s again.
How the rest of the party stacks and spreads can have a major impact on your dps. That brd or healer that has the stack marker but won't move in melee range forcing the melee to lose gcds by stacking on them outside of attack range. Or that drg that drops a toxic puddle or something right on the blms freshly deployed leylines. Or right on a bosses backside forcing melee to move out and miss positional.
Even in 24 mans rabanastre that player that gets marked for the charge runs away instead of runs close. Say goodbye to your dps.
All of these things add up to a massive impact on your dps And without all of this information anything you have is useless.
As such a personal parse can simply never be accurate enough to be useful.
As you will never be able to tell if you actually played better or the rest of the party had a bigger impact on your fps than it did last run.
In the first run maybe you got 5k.
In the second maybe you got 5.4k
Is that because you played better or because the ast threw better cards at you or the ninja made better use of trick attack in synergy with chain stratagem fornthe rest of the party made better use of there buffs.
You'd never be able to answer that with a personal parse and thus you'd never be able to explain the huge difference in dps from one run to the next. And that makes it useless as a tool.
This is why I think yoshi stance is the way it is. Because Ayers simply don't realise what makes up there for they think it's just them and how they play but the reality is there's so much more to it. Not do they realise the limitations of a parser and to many take it as gospel fact.
They are amazing tools the problem is players just don't want to learn to use them properly. They just want a number that tells them everything and that simply isnt possible