A party leader can request whatever they want, for the most part.
You should keep in mind that on Asura, wealth transfers hands significantly faster than on Carbuncle as people buy items from the AH which increases the demand of those items, and as people pay for services of others to do something for them. The point I'm making, is that gil flow/circulation [and by extension, accumulation of great gear] on Asura is such that a lot of people
can do/accomplish 2 to 5 times as much as they would on Carbuncle where progress is significantly more stagnate.
The English speaking population is also
significantly higher on Asura which means there's going to be a lot more obvious cliques and established groups and choices of people to invite. On Carbuncle, if you want to get anything done you really can't be picky about who you're choosing to invite because
you're lucky if someone even responds to your request.
This game is also old. With a number of people who've been playing for a decade or more, even if on and off. It's not uncommon for people to have
a number of mastered jobs and a
number of REMA options. Many of those REMA options being able to be used on OTHER non-mastered jobs.
I don't think it's wrong or silly to request an r15 weapon for a CP party unless you're doing it with intention of strictly being carried and aren't bringing similar caliber gear and matching the efforts.
But if you take the time to have that gear ready, and build a group with others (ls mates or w/e) with similar efforts and gears at the ready, there shouldn't be any reason to expect that a group like this
should have to carry a non-R15'd weapon, or a non-AG REMA, much less a nibiru wielding job in a CP party.
We can sit back and think to ourselves how little difference it'll probably make between an AG and R15 weapon all we want, but at the end of the day, it is that 5/6 group's choice and there's usually [at this point] plenty of R15 DD ready to take up the call.
Also, expecting a 5/6 party of fairly top notch equips that's asking for an r15 DD
to carry someone is equally, if not more, ridiculous than how some of these comments are framing the foul play they perceive to be going on here.
Also, as mentioned already, a good bit of these weapons aren't for just one job. Like, if I ever play BLU, I'm going to be ready with a few really great sword options, and a lot of experience making most of those sword WS perform well.
I'm a firm believer that we tend to segregate ourselves into performance tiers naturally. And it's not wrong to do this. It's not wrong to want similar performance in our groups.
It's kind... and awesome, even, when top notch players take the time to assist or help those well below their performance tier, but we shouldn't expect that those in those upper performance tiers are obligated to
always give out hand outs in supporting those in lesser performing tiers.
I've done countless CP parties on a mastered R15 job as a means to parse myself comparing weapons across an hour or two of time, to absolutely zero benefit to myself in terms of Capacity Points (as they are pointless for me). My interest to better myself, paid off for quite a few up and coming players in their speed at which they acquired CP. But if I *wanted* all top notch players for a non-mastered job on which I had r15 weaponry ready, I don't think it'd be right to fuss about it. [And if it takes someone an hour to put said group together, you have no idea what they were accomplishing in that hour in terms of House Chores, TV shows, Movies, Catching up on News Articles or anything and so I do not feel it's your place to judge whether they could have been making CP for that whole hour since it's the value of their time, not yours.]
If you moved to Asura from Carbuncle, you should expect a fairly huge difference in the overall server mentality of how things get done. It's not all bad, however. There is an enormous amount of more pugged content and Carbuncle in the last few years has had it's population (in droves) move to other servers, anyway. I, too, moved from Carbuncle to Asura. When I left, I think probably ~20 people from Carby moved to Asura in the same week and a half time window in June of '17. I don't think it was all that long after that that a number of French folks from Carby moved to Asura. So you'll probably see a number of familiar faces.