Hey Feint. Allow me to illustrate this through an analogy which may assist you in understanding this a bit more.
FFXIV at launch was similar to a train wreck (literally). Tanaka was the conductor and he derailed the train. It's a huge mess and after a little bit of time (2-3 months for ffxiv) the company that owns the train (SE) put it back on the tracks and found a new conductor Yoshi-p. The development of FFXIV is similar to a train which starts up slowly, slowly, then builds momentum until it becomes an unstoppable force.
The new development team took over a project that wasn't theirs, they had no familiarity with the coding, database or any other project elements. It takes time to get familiar with these things in order to build something you are confident in. Give them a few months to 'get the feel' of how the old team designed the game, find there resources and be able to confidently understand what they need to do. Very few changes, small changes, come in this time... they are basically exploring the game (from a coding standpoint) and what they can do to make changes.
Eventually they become 'experts' in the design of the game and can make changes with greater speed and efficiency. Back to the train, it's now cooking up a lot of power and starting to move at near full speed.
So it's very possible in the first 6 months they only got 5% of the current "FFXIV feel", the following 2 months they could have manage another 10%, the next 2 another 15%, and the following another 20% - which brings us to the one year marker. Where they claimed it was 50%. Now however they are moving at full speed, have more resources assigned to the project and can slam through changes easily. Getting another 40% is fairly reasonable if you think about it like this, and again as it has been repeated 4 dozen times in this thread... they said CLOSE to 100%. I would consider 85-90+% "Close" to 100%.
Just remember that this project was foreign to the new dev team and they had to figure out everything inside and out. They have said a few times that the coding is very sloppy and complex. Working on a coding project that isn't your own and trying to figure out what others did takes time. They took the time in the beginning to figure things out, which was slow to start, the changes came slow, the learning curve was massive. People shouldn't be surprised that a year later things are being pumped out quicker than before. They should be able to make more impacting changes in the same time that it took to do small tweaks beforehand.
And so is the life of a developer..... this is why I changed majors
I hope this helps to alleviate some of your worries.
