So this has been a working idea in my brain for a few years now, but I like to divide the FF games into different eras based on a few historical and technological aspects.
So for me, the franchise is divided into 4 eras currently:
1st Era - FFI-FFV/MQ - The Sakaguchi Era (1987 - 1992)
2nd Era - FFVI/SoM - FFXI - The "Golden" Era (1993 - 2002)
3rd Era - FFX-2 - FFXV - SE "Franchise" Era (2003 - 2015)
4th Era FFVIIR - Now - The Modern Era (2016 - Now)
I may elaborate when I have more time. Does anyone else do stuff like this?