FFX was released a LONG time ago. Isn't it a little late to be bringing this up? Why not mention the changes from FFX to FFXI? Matter of fact, to be fair, the ENTIRE series has been constant flux. Shall we revisit it?

I-II: Abandoned the job system for a stat development system where free reign over the development of the characters was given. Emphasis was also placed on the storyline and characters, as the characters were given actual personalities. The concept of rows (front row, back row) was introduced. Chocobos were first introduced here.

II-III: The job system was brought back, only now with the ability to switch jobs at any time, and many new jobs (such as geomancer, summoner, bard and scholar) and abilities were introduced (thieves could now steal, dragon knights could jump, etc.). The emphasis on the battle system was also brought back. Moogles were first introduced here. This was also the first game to include more than one world map. This game also remedied the "ineffective strike" with auto-target.

III-IV: The party was expanded to 5 members, and magic was obtained by levelling up instead of purchasing it. Once again the story took precedence, and the characters were once again actual characters instead of random nameless warriors of light. The ATB system was first used here.

IV-V: The job system made another triumphant return, and the ever popular Blue Mage and Time Mage classes were introduced. Also, the concept of combining jobs was used for the first time.

V-VI: A much more cinematic direction was taken with the series, and the magicite and relic systems were implemented. Also, for the first time could could play as a non-humanoid character. The concept of desperation attacks was introduced, and secret characters were available for the first time.

VI-VII: The style took a drastic change from swords and sorcery to cyberpunk, and the character designer changed from Yo[img]/xxx.gif[/img][img]/xxx.gif[/img][img]/xxx.gif[/img][img]/xxx.gif[/img]aka Amano to Tetsuya Nomura. Any semblance of a job system was completely gotten rid of as the materia system came into play. The desperation attack was refined into the limit break. This was the first game to use 3D graphics and FMVs. It was also the first to include actual vocal samples. The party size was changed from 4 to 3.

VII-VIII: The focus was shifted to a "romantic" story. Also, the battle system took a radical change and used the para-magic system and the junction system. The concept of timed strikes was first used in the FF series (it had origins in Mario RPG, but hadn't been used in FF before). This was the first game to include moombas.

VIII-IX: Again, the game changed radically from its predecessor. Inherent jobs were brought back, but abilities were learned through equipment. The party size was changed back to 4, and the swords and sorcery setting was used once again. The limit break system was modified into the trance system.

IX-X: From swords and sorcery to post-apocalyptic fantasy. This game removed the world map, included voiced characters, changed the party size back to three, and went back to the limit break system (renamed overdrive). The job system was changed out for the sphere grid system, which basically allowed characters to learn any ability, although they all started with specific ability sets which mimiced the job system. Weapons and armor also became customizable. The battle system was changed to the CTB system.

X-X2: The battle system was changed to a new version of the ATB system, and the job system returned. Other than that I don't really know anything about the game.

X2-XI: The game was the first FF game to be a MMORPG. The setting changed back to swords and sorcery, and the job system was given a new twist with sub-jobs. Skillchains and magic bursts showed up for the first time. The battle system changed to RTB, and party size was expanded to 6 characters, and alliances were introduced to the series, as well as linkshells. Item crafting and "farming" were introduced. Enemy encounters were changed from random to aggression based.

As you can see, the series has been changing drastically ever since FFII came out. The series doesn't know the meaning of the word "constant". Changes are happening. Changes will always happen. They'll happen whether you like them or not. It is the changes that keep the series vital. Remember the days of Street Fighter II?