Hi Dyne,
I posted this in an earlier thread, regarding the SE Interview in Dengeki Magazine. But this might help some of your concerns...
I understand both sides of the argument about the "Same Rank Class = Instant Same Rank Job." I think initially, my gut reaction was, "Aw... isn't that just too 'easy' then?"

But then I thought about it some more, and thought about Matsui's official post about Job Quests to unlock the job and exclusive skills.
We don't know what the final implementation is like, so this is all speculation, but as physic and Wind have pointed out:
- Rank 50 Gladiator = Rank 50 Paladin is Not A Bad Thing.
- Job Quest and Skill Quests: Matsui has said that we're getting Quests to unlock the Job and Skills. If this turns out to be *multiple*, challenging, interesting Quests to (A) Unlock the Job; and then (B) to Unlock Each New Skill, that's far more engaging and interesting than just getting "Paladin Rank 1" and grinding.
- Job Specific Equipment (JSE) Quests: We've seen the Concept Art for JSE Armor for Black Mage and Dark Knight, and Yoshida-san has mentioned it's coming. So this is another set of more meaningful content (instead of just grinding 1 - 50).
- Same Grind AGAIN (Leves, Efts, Raptors) To Be Able To Use New Job Fully? No Thanks.
Let's say they gave us Paladin Rank 1 after you reached Gladiator Rank 50. Do you really want to grind the same Nanawa Mines, Efts, Raptors, Guildleves for another 50 (FIFTY) Ranks just to be able to fully utilize Paladin skills? (and then repeat that over every other Class in the game?) As much of a Final Fantasy fan as I am, I'd probably say "No."
- Class Rank = Job Rank Means You're Ready for Real Raid Dungeons & New Content Now.

As Wind said, grinding Rank 1 to 50 *again* on, say, Paladin, is *not* real "content." I would hope most of us would want to *use* the (hopefully) cool, new Paladin Skills / Weaponskills, *for* stuff like the Rank 30 and Rank 50 Raid Dungeons and New NMs and New Frontier Quest Hubs.
So, having it so that we're the same Rank at our new Job as the Class that unlocked it means we're basically "Ready!" to jump into the exciting, meaningful real New Content as soon as it gets delivered.
If it was the other way, then, say a new Patch gets released. "Oh, we have New Raid Dungeons and New NMs and Grand Company Challenges... but they're balanced for Paladin, Monk, White Mage, etc. OK, let's spend ~4 - 12 WEEKS grinding Paladin from Rank 1 to 50 and THEN we can start to have fun with those new Dungeons and Challenges." That'd be frustrating, no?
- 1 Job for 1 Class. More To Come / More To Explore.
For those that are worried about 1:1 unlock, it does seem a bit limiting, but there's no reason they couldn't add more Jobs per Class later. It's better to start small and focused, instead of having too many Jobs and not have them all balanced properly (or need a lot more time before unleashing them in a Patch for us).
Also, it encourages more "Class Exploration." I think one of the biggest question marks is which Class unlocks White Mage vs. Black Mage? That's a great question.
As an example, let's say, Conjurer unlocks White Mage, and Thaumaturge unlocks Black Mage.
At first, you might think, "Aw darn it! I'm a R50 Conjurer already and I want to cast Elemental Spells / be a Nuker!" Well, it's not a bad thing to now *explore* playing Thaumaturge to unlock the Black Mage Class. No one has said that you have to play THM to Rank 50 to unlock the Job Quest. It could be Rank 20 or 30 (which is really easy to get to with the fast SP these days). You get THM to R20 or 30, unlock the Black Mage Quest and start working your way through that (hopefully interesting set of Challenges / Quests).
- Real Content: Raid Dungeons, Grand Companies, Frontier Quest Hubs
The real "content" that's already been confirmed for this next patch 1.18 should be the R30 and R50 Raid Dungeons, which will hopefully be tied into the Grand Companies and a developing Rank System (SE has hinted that you can earn better equipment and items via the Grand Companies, so hopefully it's a long-term goal-oriented system, like a Reputation / Points System, or working towards stuff like Relic Weapons / Armor).
In addition, we're getting the Frontier Quest Hubs, which should also give us more interesting things to do than repeat the same Guildleves we've been doing the past 9 months.
This stuff should be the real content (along with more NMs (which they said are on the way), and more Dungeons, etc.). It shouldn't be grinding a Job from 1 - 50.
Of course all this could be moot after we find out the full details, but let's try and stay positive.
