Need a bit of help as someone going back into DPS after so long of healing...

I'm a bit ignorant so please bare with me.

Does it look like with the new changes... is there a reason not to fill every DPS slot with samurai over the other DPS? Is the other DPS buffs/debuff outweigh samurais DPS (because from what I understand they hit much harder)

To further this, if it doesn't warrant everyone going sam... how many sam? Just 1?

Please keep in mind the last time I went heavy DPS was in 1.0 when we stacked monks or black mages... and lost the elemental wheel as a result