I think FF14 is different than other MMOs in that it does have game design equivalent to a single player jrpg, or rather, rpgs that have MMO like designs like Xenoblade or Dragon Age Inquisition or FF12 and FF15. I think I got to the level cap of the original game in like 1 or 2 months of just playing occasionally and on weekends. I mostly leveled by grinding dungeons.