These threads all have the same underlying subject.
"Something I don't like or disagree with is or may be implemented into the game. I don't have the full details, but I'm going to call doom and gloom because of how I perceive it."
But at least it's different than his "I think this system should be added or replaced because I know what's best for the game and I care for absolutely nobody else's experience in this game."
EDIT: To contribute to the "discussion":
Having EXP and levels gained through missions and quests isn't a bad thing. It certainly doesn't eliminate grind leveling if that's what you're into, because as long as mobs give EXP when killed, someone will find a way to level off that exclusively.
Secondly, we have no idea how these quests will be structured. Could they be go kill X mobs for Y drops and return to NPC? Sure. But they could be any number of other things. There's a limit on how creative quests can be.
Honestly, if you've already admitted that grinding quests for EXP is little different than grinding mobs, then why does it matter?
You don't like quest chaining. Fine, go kill mobs for hours. It's the same thing, except one has a small story attached to it.
It honestly feels MORE Final Fantasy like. You know how you level'd in past FF games? You progressed through the story and killed whatever got in your way. I don't know about you, but in other FF games, I didn't walk around one area of the overworld getting into random encounters repeatedly for EXP. I went from one quest/mission point to another, killed what got in my way, killed whatever bosses I had to and this usually gave me a great amount of EXP.
You're not going to lose the ability to go out and kill random monsters because you feel like it. That's always going to be there. Is it going to be more efficient than doing actual storyline? Who knows!
Also, you nor I nor anyone here knows exactly what is going to be instanced and what isn't. Let's look at 2.0 Primals for example:
Ifrit will be roaming. Where will he be roaming? Probably the Amal'jaa Stronghold of Zahar'ak. I highly doubt he's just going to be roaming around the entire region of Thanalan. Now you find him in Zahar'ak and when you engage, your party is drawn into the Bowl of Embers.
Oh snap! A nice mix of open world and instance! Holy balls! It CAN be done!
(The Ifrit reference is speculation and only used as an example.)