The only time i felt the need to read a guide for Ninja was during 3.2 when i couldn't beat the A8S dummy, was failing at 3%, which is what full party buff is and would be met while inside A8S, but i still wanted to get it down since it's possible, so i went to read guides and found out that the Opener was somewhat wrong.
Then i proceed to test the new opener, still wasn't enough, so i proceed to reddit and people told me my crit was too low, end of story.
I didn't use a parser to learn my Job, i'm not special, why would other people need a parser to learn their Job?