I also think that if you get PL'd all the way to 50 then you really don't know how to play your job because you really don't know what your ability/job is capable of or what they do.
Stupidest thing I've heard in my life.

Killing mobs over and over does not train you for any endgame content at all, you can go through your skill list to learn read them and you know what they do, can spend 10 mins in a pt to get a feel of whats best or ask someone and bam you've learnt the job

End of the day each class turns down to "1-2-3-4-5-6-7-8-9" ...