Hopefully the devs don't think like you, otherwise this is going to turn into a bigger mess than FFXI or WoW during TBC. It's not that difficult to do.
The only reason GLA was changed to being defensive was because it would be a waste of resources to make the class hybrid or middle of the road and give it no option outside of tanking. This is between the limited changes they could bring us as well as limitations of the game engine and their restrictive design in 1.0.i never said it would be. building it from the GLA will require it to be too defensive. because, aside from it's WSs, all of it's abilities are defensive. you cannot reliably build a DD from GLA because half of it's abilities are defensive in nature. The other half are WSs.
That's what we call synergy between the job and its classes/subclasses. It's not a far shot from specializations, which I am rather fond of. You can make a class with a slew of abilities and some abilities become better either through bonus scaling or role emphasis from traits once you go into a job. It's why I took the other two improved defense traits from GLA and turned them into Armor Mastery for PLD. Likewise, I grabbed the two potential improved attack traits and turned them into Great Sword Mastery for DRK. A GLA baseline would have one defensive trait, one offensive trait, and gain more depending on the job they choose.so to make a DD class you want to make it half your abilities do absolutely nothing for you. all of it's offense now comes from sub class abilities and it's drain abilities. brilliant plan.
Due to the changes in design, GLA at the most would provide some utility, some survivability for DRK along with its bread and butter weapon skills (as DPS they'd have more chances to use Goring Blade and Riot Blade, and those would do more damage as DRK would be using them with a great sword). Assuming MRD enters the picture as a subclass, it could then provide Bloodbath. LNC would provide Blood for Blood and Invigorate. Mind you, that's with the limited number of abilities we have. We won't know how much else the devs will be adding to the game in terms of abilities and what they will be opening up for cross-classing.
Indeed, and that's kind of the point of the OP.without a major change to it's abilities then you will not be able to reliably build a DD class from GLA.
I can concede to this, except that my intention was to keep parry on MRD and out of GLA regardless of whether they're using a sword or great sword. Having both share parry in some capacity would be messy unless you somehow change parries so that DRK at most gets partial parries (and even then, mitigate a lot less damage than a MRD/WAR would) while full parries can only be done by MRD. Or having MRD/WAR parry values and ratings scale with STR and not scale at all for G.Sword GLA or DRK.Make a new mechanic for only one class to compensate for a lack of offensive abilities. (IE: graze)
what you're proposing is essentially a combination of parry and block. why in the world would we not just make it parry?
contrary to your belief, introducing this would make DRK a tank.
why? because then you can parry AND graze. a GLA with foresight now has more defensive abilities than PLD, because you cannot parry with a shield. and because you have access to sentinel and damage=hate.
At least to me, it's simpler to just remove parry from the table and give DRK a mitigation mechanic that is there only for self-preservation. Unless you feel the drains are enough, which I'm willing to concider.
As for Sentinel/Rampart, there's an easy fix to that: make them require a shield to use. No shield, no access. Or again, if Sentinel were 20% damage reduction, make it 5% damage reduction when using a two-handed sword.
Keep in mind that DRK would not have Flash (moved to PLD), Aegis Boon, Wardrum, the enmity modifier on flat blade, full-strength Rampart and full-strength Sentinel (or simply no access to either ability). It would have inferior armor scaling, less mitigation gains from VIT, Foresight from MRD and Provoke from MRD. A DRK would not want to get hit, nor would they have the toolkit needed to actually be a tank. Graze's might mitigate some damage from physical AoEs, but they're not going to make up for all the other things you're missing.
The better alternative.GLA => RDM = Support/utility.