Abandoning chocobos for magitek armor: the making of Final Fantasy VI
These days we understand how to make video games work as a narrative medium, but much of that theory was still being developed back in the 80s and early 90s,. Not everybody understood yet how to make hours of turn-based combat make sense as part of a grand dramatic tale of politics and power.
It's interesting to read about the way Square Enix accomplished that and made Final Fantasy VI more than the sum of its parts. It seems to have largely been due to the role Hironobu Sakaguchi played on the development team.
Whichever side you choose in the endless "which is the best Final Fantasy game" debate, this article should at least convince you that Final Fantasy VI was the most influential, and likely changed the face of the series forever.