These are questions already answered before but I'll go over them.
Special chararactistics are kept out of gear because all that it contributes to is stat inflation. Everything boils down to DPS and if you create special stats then you're just adding to the factors into DPS. In a vertical progression MMO, you begin to invalidate gear before you even create it because gear with "Special Stat X" is better than the gear you created in the following patch ,because of that special stat, unless you increase the base stats to compensate on it. Then you deal with the major issue of Power Creep.
In short, special stats are a design nightmare. They do nothing more to the bottom line than complicate things, for the player and developer both. They've heard feedback regarding the desire for it and have said they'd 'consider' it. But keep in mind consider is not accept. They've carried the same speech on this since Beta. I'm not expecting it to change soon.
"Why not skill trees?" most common answer comes from both the player base and the developers in tandeum. In short, you don't have skill trees because you don't NEED skill trees. In game you are not locked down to a certain Job and each job approaches the base role differently. In this case, if you wanted to lean more on the DPS end of Ranged, you'd go Machinist. This is the trade off for the Job/Armory system. You get to pick multiple classes, as many as you want to level and gear really, but each are played optimally one way.
They don't want to complicate the roles of each Job - that goes directly against the ease-of-access approach they have for this game. We may, eventually, see something similar to a 'merit' system like they created for Final Fantasy XI, but that system was not mean to be easily exchangeable.
It's not lazy design - it was an intentional choice made to adhere to the sense of identity that comes with being a part of the Final Fantasy franchise, no only do they want to keep that identity, but they're wanting it to be easier for the new players coming in, to pick up and play.
That will never change. That's what a vertical progression MMO means. It means you're never at the top. There's always higher to go, and the gear that does not add up to par will fall into the field of Glamour usage. If that's make or break for you, do not come back - because that's a part of this game's backbone - and you shouldn't expect it to change at this point.This esoteric gear will be outdated by 3.2ish and we really gain nothing for our job other than a few boosted stats.