How would an optional, official parser be toxic?

[Dualgunner]

apply what you do on the dummy in the actual fight. play the game you use the dummies to build up muscle memory. its job is not to simulate a fight its asking a simple question: does this person know the mechanics of the job they are playing yes or no

EDIT:

Therein lies the principle issue with relying on Stone Sky Sea as a stand-in for a parser, or even as a gatekeeper. Not every fight will let you belt off your optimal rotation; whether it's due to boss jumping, aoes pulling you out of melee range, repeated aoe dropping giving no time for even a slidecast, or many many other things, a static dummy will not be good preparation for that.

A parser helps in the making of decisions regarding rotation optimization. What gives me the bigger damage output in the end; using embolden on cooldown and executing a double emboldened finisher on the Level Checker in O11S? Or holding it and executing it after Level Checker, since my group can kill Level Checker in either case and using a burst window on the boss is a better use of the group's time?