A large group of the community would benefit form this and actually wants this since this subject pops up about every month. However, if they were to add practice modes, the current SCoB farmers would clear the next tier within 2 weeks.

I think that endgame content should have some value to it. When everything is cleared in the first or second week, it kind of takes that away. I'm very much for your idea. I just can't think of something which would complement both teaching your FC/buddies and keeping the value. I also can't think of another, respected MMO where endgame does not have a weekly lockout.

I like your point about multiple jobs. They basically are mannequins which you put gear on looted with your main.