So... that spiderman shirt... (new job tease)

[Alacran]

You have a tank/healer shortage because of the bonus system. tanks and healer being more rare, means they get into dungeons faster. the bonus system also makes them level up faster. That means the tanks and healers are at cap in half the amount of dungeons that a DPS takes. Ignoring the extra time the DPS are sitting in the queue. imo, the bonus should be given to the people who have to wait 30 minutes or an hour or no bonus given at all. Play style preference should not be penalized. But that is a different discussion.

There shortages of both Tanks and Healers is due to a (very real) notion that playing as these roles is stressful due to the amount of responsibilities/ expectations placed apon them by the player base. I can only speak as a Tank myself as i have never leveled a Healer, however many a time i have been told any number of "helpful tips" in not so kind a fashion that i wasn't pulling fast enough, the mechanics were not being done right, there was no need to keep defense stance up/ need to increase DPS, ect... All of this mind you was five hours after content patch dropped and release of new dungeons.

As a Tank, you are the leader of the party, you must know the best route, the proper way to engage, take into account party make up, your own comfort at the number of enemies you can safely engage, positioning, resources (your HP, MP, TP). In higher level content the added caveat of other Tanks not taking adds, comes in to play as does to need to take into account of other groups priorities.

Time and again i have said, i want Samurai to be a Tank. It simply fits as few Tank specific jobs in the FF series, (how sad would an eventual implementation of Genji Armor be with a DPS SAM, unable to wear it?) however it's not difficult to see why so many more want it as a DPS. That's what makes que time last for so long, seven of the thirteen(soon fifteen?) currently available jobs are DPS(soon eight?). Take into account that few people want to play these roles (as shown by need of a bonus) and it becomes clear that very simply DPS is the more favored and more abundant role, of course it would be, overall it has the least responsibilities, they very much are a dime a dozen, adding Samurai to that will only saturate an already bloated DPS force. Having such disparity at 4.0 launch (a fresh level 50 DPS) will break game balance ans leave a mess that while sustainable, would be one less head ache should a more reasonable approach be used.

one ranged magical Dps.
One Tank/Healer.

[GMERC]

(how sad would an eventual implementation of Genji Armor be with a DPS SAM, unable to wear it?)

Not even going to address the "b-but the queues" silliness, since it doesn't matter, but Ninjas and Dragoons have repeatedly been able to equip Genji Armor in the past. Put Samurai in the Dragoon weight class (Maiming) and you wouldn't have to worry how "sad" it would be.

Samurai will be whatever the developers decide it should be, but queues are absolutely not going to be the reason for it.