At this point you don't necessarily need to go in with the class you're trying to get gear for. The other effect of the loot roll restriction is that people won't be rolling on everything just because they can, just so they can trade it for GC seals or desynthesise it. So your chance of acquiring an item you do roll on is much higher.

I guess the degree of frustratingness depends on how specific your wishlist is, and how urgently you want it.

(Restricted loot rolls meant I collected the entire Orbonne tank set while it was current without having to play as tank to get it.)