How would an optional, official parser be toxic?

[thegreatonemal]

There's more to simply "doing your rotation", as someone with higher ping, its difficult to weave abilities certain abilities, (for example on rdm, trying to use both contra sixte and fleche in the same gdc cool down) with a parse I can experiment to see and learn exactly the best time to to use my abilities. Also, perhaps I am running for too long after an aoe drops? If I actively reduce the amount of time, how much difference would it make?
Little things like that, which can add up.

All of which you don't need a parser for that as i do those things fine without one being a ps4 player you just need experience with the fight. and as for your first point
stop double weaving or play a class that has little to no need of it.