No, I don't think you should have to do any "suffering" through playing on a class/job you don't want to play on just to be able to go back and mindlessly grind through an area on FATEs and dungeons to level up your actual desired job.
"Song dogs barking at the break of dawn, lightning pushes the edges of a thunderstorm; and these streets, quiet as a sleeping army, send their battered dreams to heaven."
Hipparion Tribe (Sagolii)Â - Â Antimony Jhanhi's Wiki