Beginning of Shadowbringers. I had the game since mid-Stormblood, but never got into it at the time because I was still playing GW2 back then. Then when my guild there went mostly inactive I picked up FFXIV again which had just released ShB anyways. And yeah you're right, from all I can read this was much more unique in the past, like most MMORPGs the devs eventually homogenize based on the player-desire to play whatever they want in high-end content which requires tight balancing which naturally erodes class identities.
I should note that I've ... seen some designs. I started MMO gaming back in 1999 with some M59, and since then have always had an MMO as my filler game of choice, EQ1 then DAoC then WoW then GW2 and now FFXIV. FFXIV unique does very little with its jobs, however it's not the most homogenized game I have played (that'd be GW2, for entirely different mechanical reasons than here though). And in itself it's not a bad thing, but it requires a careful balance if identity of gameplay feel to pull of mechanical homogenization and lack of gameplay identity but still giving lore identity and making moment-to-moment play feel unique. GW2 kinda could do this at first, it did however fall apart later on. WoW struggled hard with this at some point around late WotLK and early Cataclysm, and later overcame it somewhat.
If I had to guess, FFXIV already has a very strong visual identity, so ideally they'd lean heavily into animations and visuals to promote a different feel while keeping the underlying mechanics to be mostly similar.