Well, they aren't done modifying everything to revolve around 4 player and 8 player parties. All they really did was Reduce the max players from 15 to 8 and adjust the SP, The behest (Horrible adjustment if I might add), then add a buff for 4 and 8 players. 4 players is really meant to be a normal size group, while 8 will be the current raid size. Tho, I hope they do add more 4-player dungeons for higher ranks in the future. Making only a Raid dungeon for the high ranks and only a group dungeon for mid ranks to start off is probably a bad move. But we will see.

And yea, you will most likely need to have a job in order to be successful in the dungeons.