I believe you're thinking of someone else. That said, I'll still address this since it does apply to me in some respect. All VT/IT are not equal. On RDM I am capable of beating down basically any mob in Dho Gates with fair amounts of ease, they are for all intents and purposes classified as IT mobs. I require no Trusts nor do I require Distract for me to cap accuracy on these mobs. That said, Woh Gates is quite the opposite. They have high enough EVA that I require Accuracy Songs at very least on top of Food in order to cap Accuracy, and I think I need more than that still. Mind you I'm running what used to be the best possible Accuracy set for a RDM and I'm not likely to be far off still so these mobs are quite the issue.
All of that said, this is also assuming normal mobs are the extent of what you wish to fight. With songs I am capable of capping Accuracy on Gessho, the second most evasive NM of the MPNMs so far as I'm aware. That is on Difficult however, put me on Very Difficult and even in my high Accuracy set with full buffs and constantly keeping up Distract II and you'd see my Accuracy still quite a bit away from cap. Put me against AAMR and you'd see it get even worse, as generally I don't cap Accuracy on her even on Difficult in my Accuracy gear. So, it truly depends on the extent of what you wish to fight. If the mobs of Dho Gates are your only interest then RDM has no deep Accuracy issues and as such is fine as is. If you wish to push the limits and fight the hardest, most evasive mobs in the game, using gear sets built specifically to excel at such... you're going to be disapointed, and a large source of our missing Accuracy comes in the form of gear(specifically legs, for which we have no good Accuracy piece...) and our skill rating being only a B, rather than B+~A.
Though I admittedly only read this after my last part of my reply, I believe my previous bit of this reply addresses this as well.
I believe you misunderstand. I am not saying we should have
great shield skill, but rather, we should have skill to use a shield. For simplicity sake, I'll use a graph to show what I mean.
This graph shows the skill at level 99 for every skill level and how it scales. As you can see, D, E, and F, are all far behind the others. The slope is insane at those levels, if you're in one of those 3 categories your skill is so far behind that to some extent you might as well not even have the skill at all. RDM is a F rank Shield user, our skill is literally 103 behind C-, which is the first reasonable amount of skill on the chart. I'm not asking for us to have A+ or even B, just C- alone would allow us to make use of our shield. Currently even with a Beatific Shield +1 which is our best option for shields, we have only 372 skill, just under a C rank level 99's skill. That's a 119 shield's skill added to our natural, that's to say at level 119 a RDM should be just barely able to block a good deal of attacks from level 99 targets. See what I mean about how bad that is? At least if we had a C- skill rank we'd end up with 475 skill with this shield, which would be far behind that of most jobs still, but enough we could at least use our 119 Shield on level 99(~105?) targets with some effect.
While this is true, the main thing I take issue with is our capability to fill a melee role. The one and only time you truly go into an event asking for someone to be ready to switch it up on notice is when you've never done said event before. It's extremely rare for me to go into an event as a supporter via healing, buffing, and enfeebling, and during said event be asked to change to a frontline fighter Hasting, healing, and keeping up basic enfeebles. Ignoring the fact I use completely different subjobs for each of these roles and the fact no subjob can fit both well at once, it's simply not common to need such things.
I accept and admit our role in combat even on the frontlines largely includes support. That said, I don't think that is an excuse to rip away power from the job that it needs in order to close the gap between it and other jobs. As I said before, if we had even 80% of the damage of other jobs in equal gear then that'd be one thing. The fact of the matter is that it's not really the case, and the gap we do have isn't one that Haste II & Distract II can make up for alone. They are our only true support aspects we can keep up easily on the frontlines without drastically hindering our damage to the point of making us even less powerful/desirable.