1. I'll address point 4 here as well. If you think that, then the class should only have traits and abilities that all of its jobs can utilize. DRKs are going to QQ that they have 2 dead abilities (phalanx and war drum) as well as 2 dead traits (your shield traits). PLDs would QQ about having 2 dead traits (your great sword traits). The great sword traits should be moved to DRK, the shield abilities (phalanx and war drum) along with the shield traits should be moved to PLD, and those 4 traits and 2 abilities should be replaced on GLA with ones that would benefit both PLD and DRK. We are getting a level cap increase sometime (Yoshi-P has said he wants to increase it at regular intervals rather than wait for a long time like 11 did), so don't have to keep it as we have now.
2. You're comparing two completely different games and gaming companies here. In WoW, far more attacks are made in 12 secs than in 20 secs for FFXIV. Also, the community here feels that PLD is underpowered, where in WoW the community felt (as you've said) that PLD was OP. Also, recast is not moot based on your comment about 2-hr abilities from 11. And I don't think WoW ever had an ability that had a recast of longer than 10 mins let alone 5. I also believe that blizzard was just taking the lazy route using an immunity ability as an excuse to do nothing.
3. Why, all rapiers are swords after all. Though not all swords are rapiers.
4. addressed in 1.
5. I would change the wording on Flash to something like "Generates large enmity on target and all enemies around it. Has a high chance to inflict blind." I say this because the AoE enmity is the major point of Flash for PLDs to AoE tank.
6. Makes better sense now thank you.