It's official Parsers are illegal in FFXIV

[ispano]

-snip-

You'd be incorrect actually. Knowing what all your skills do is all fine and good, but knowing which order to use them in and how to change it up in certain situations, you won't always know what's optimal without doing the math. Even if you don't use a parser, there's still math to figure out how to string things together in the most optimal way. RPGs of this sort are, and always have been, numbers games. Or how about knowing if Skill Speed/Crit/Determination on a given item will boost your DPS over another? You have to see the numbers to figure that out.