While Katie may have convey this feeling a bit brashly, i completely understand why she, and others feel RDM is worth discussing here. I truly understand the enthusiasm for those that want these jobs but, you also need consider why RDM is brought up here, because RDM would also be brought up if we were to talk about a job like Sage. FF has many jobs and ffxiv has typically taken attributes of jobs and combined them, examples being:
Berserker(FFV) and Viking(FFlll) to our Warrior.
Time Mage(FFV) to our Astrologian this one is interesting as AST originally had access to Haste/ga(old arrow/spread arrow but players often complained about this buff as it would misalign rotations do to not speeding up ogcd cooldowns), slow isn't feasible unless it's on mobs, it does have gravity, Lightspeed(a form of haste) and astral stasis(LB3) is lore wise rewinding time. i believe the devs have also hinted at AST being their attempt at time mage but i can't recall where.
Ranger(FF lll/V) to our Bard if anything, our bard is more a ranger than a bard as edward used a harp as a wep in FFIV and that didn't seem feasible enough to make 2 seperate jobs out of.
Mystic Knight(FFV) to our Red Mage. The only difference here is that while both jobs have the ability to use magic, the mystic knight imbues any of the spells learned as sword attacks adding magical elements to them (flare sword), this however is something RDM in concept, should be able to do. the enchanted melee combo is imbued with unaspected magic which is the same wording used for Ruin, Broil, Malefic, Holy, Darkness, Flare, and Red Magic in the world of XIV. this means in a later expansion, instead of giving us a new job thats thematically similar to red mage but their variety of spells are just sword strikes; we can just improve on the RDMs kit to implement these things. XIV version RDM as far as i know is the first to use unique sword magic in the form of Fleche and Contre Sixte which have the benefits of being physical hits that are obviously magic and that easily be explored more. i understand why you feel mystic knight could justifiably be it's own job because of the potential to be different, but RDM is already doing similar things you're listing, and all i'd see is a job thats basically rdm but instead it's fire strike, thunder strike, and aero strike instead of Verthunder, veraero, and verfire. some of you guys also mention buffs like Enfire, and Enwater as reasons for a Mystic Knight, but these were spells RDM also had access to in FFXI and are just adding magic to sword strikes which RDM already does.
I personally think it'd be easier to work Flare sword/ Holy sword etc... into RDM(Alisae has shown that Red Mage is capable of using very powerful sword magic and imbuing alot of aether into her blade), than it would be to make an entirely new job for the sole purpose of expanding on that one aspect of which the RDM already has. it's the same reason we don't need a job like Sage because the best thing about it is that it can use WHM, BLM and summons. RDM doesn't have the ability to use summons so that is the only real distinction between the 2. does this mean we should get a sage job? I say a hard no.
there a much better choices that i'd personally would like to see that are different enough from the jobs we have. Necromancer, Mime, and chemist are 3 very interesting to implement jobs that aren't thematically similar to other jobs we currently have.
This isn't me saying, you can't have it or it would be a bad idea and the devs would never do it. this is me saying what you're asking for can be used to improve on an existing jobs appeal instead of asking for a whole new one. It's not uncommon to hear players complain that 14s RDM is very shallow and missing a lot of depth. i often call it an expansion of 2.0s BLM as i feel this version of RDM is just style and lacking a lot of substance. These things you want to give away to a new job can be used to give RDM the substance the community actively feels it's missing.
This is why i think RDM is indeed relevant to the dicussion of a Melee spellblade job.
This is a public forum, and as long as the topic isn't completely off topic. everyone's input is welcome regardless of if you choose to humor it. RDM IS RELEVANT TO THE DISCUSSION OF A NEW MAGICAL SPELL BLADE MELEE DPS saying it isn't is like saying NIN/ROG aren't relevant to the discussion of a new Thief job(even if the thief job was a ranged that used throwing knives or however else people like to spin these difference) and we don't need a new job for every little distinction that someone decides to expand on. it's ok to have some of the current jobs pull aspects of other possible jobs to prevent job bloat and more balancing nightmares. we already have enough melee dps as it is