I specified Savage because you wrote it there. And your assertion is as much a half-truth now as then. Behind after a certain point into the tier the community WILL come to leave you unless you focus your gear into a specific gear type. Yes, you can raid as whatever you like when gear is barely raised from the uncapped tome's level of gear. But that gap will increase, and item levels will become unreachable without dedicating a higher and higher cumulative portion of gear to a single gear type. You do NOT have indefinite access to Savage as an alt (unless running with friends who will accept below average ilvls). That is simple fact. Look at the item levels near the end of any given tier. They are often high enough for even mostly main-only characters to be unable to continue waiting on BiS raid drops, forcing them to spend currency to meet the requests of a PF rather than saving it for a secondary's BiS currency gear, to continue to join PFs. Without any raid drops, many PFs will assume the ilvl of all crafted slots + the entirety of your weekly-capped currency (assuming weapon or chest/legs first) have been spent on a single gear type just to join. This makes it difficult to maintain permissible gear levels for those who are taken as one type one week and another the next (i.e. static-less players who have time enough to grind for gear, but not time enough in exact consistent overlap with a specific 7 other players).
(24-man raids) This is not a new issue, nor would separate caps extend it if the 24-mans actually provided benefits to everyone in the first place. Consider who among single-job players are going to do 4.1 at all when they offer inferior—not even alternatives but outright ilvl-inferior—loot to what they'd already gained last tier? They'll grab whatever twine/coats they still need and then they're done.
That issue's already come up in plenty of threads since Syrcus Tower, and the leading suggestion's been the same: give it the same ilvl as the latest weekly gear and make it upgradeable (which would affect ilvl growth rates), or make it upgradeable via capped currency in a way that essentially absorbs the difference in cost over ilvl growth (which would not).
Which is all the more crucial when you only have the one pool of currency and raid loot to split among all of them. Damn right you're going to prefer what gives you multiple jobs in one. How, how is this possibly a unique or novel concern? That IS XIV in a nutshell. That is gear types. They are not equal to the number of roles except in "AF" weekly cap tiers. I think this has been the case long enough to recognize this fact as less than a Doomsday event. If you believe there are improvements possible to it to bring it more in line with the number of roles, I'm all ears, but this concern is entirely tangential.
I never said it wouldn't speed up the process of gearing alts substantially. I relish the idea. I said it wouldn't speed up the process of gearing your MAIN. What you could do for your main now, with n (number of gear types you care to gear) multiples of time you could do for the rest. Is this complicated? The basic idea is that if you could have a BiS main in 3 weeks before, with 4x the total time spent you could have 4 BiS gear types under what I'm proposing.... Assuming no additional changes, if you overcap by more over a given week than n times your daily roulette bonuses, it will be faster than that basic n multiplier. If not, then then time required would be greater than given by a simple multiplier.
And in the meantime, you actually didn't quit after gearing a single job, waiting until post-tier farm groups to bother with alts, you participated in far more raids, and ran far, far more dungeons, while Ivalice gives later-upgradable gear alternatives to your rollover savage gear so that if you're truly fanatical about BiS across all those alts you'll be running that for n pieces of loot per week... Admittedly, perhaps I'm not thinking vividly about the queues yet, but I fail to see how that broad picture has lost anything. What fixes 24-mans for BiS single-job players also fixes it for separately capped alts.
:: My only fear in this would be that the ability to grind out so much gear would inflate gear requirements to a point where casual players would be left behind. But the thing is we're already on the brink of that even when gearing just 1-2 jobs, and that same system punishes spreading that gear around. No other MMO does that. Anywhere else, what you play (and how much thereof) is what you get. What would be so wrong with that being the case for XIV?
If the amount of people willing to take advantage of their full gearing opportunities are too few to be concerned with them, why would it suddenly be a new and rampant concern that... a few people are willing to take advantage of their full gearing opportunities, minus the 1000-character edit, so to speak? The two situations are identical, save that it's costing less data on SE's end and more convenient on our end (unless needing that extra inventory space).