@Zeke People will quit and never come back because they finished it. The idea of an MMO is to have too much content to actually finish for anyone other than for hardcore players and then release new content to keep people interested.
Have you hit level 20 on a main and sub class?
Did you try other classes and getting them to 20?
Do you have maxed out rarity 4 star NGS weapons?
How about maxed out rarity 4 star units?
Are those also augmented?
Did you find all 113 red boxes?
Have you done all the towers and cocoons?
Have you noticed there is a collectable sheet for each area? Did you get those yet?
I don't know why people are claiming it doesn't have much to do when I'm seeing plenty. Just because you don't like what they're offering doesn't make it obsolete in terms of content.
Also people said the same damn thing when FF14 AAR came out. Game seems to be doing great regardless of what people said about it. This game will be the same due to how popular the Phantasy Star franchise is.