Originally Posted by
Saidosha
The crossover was pretty much bog standard mobile gacha fare in terms of story telling, and that's usually something like, "Otherworldly element appears for random reason, you team up with the good guys to defeat their themely bads, and then they just disappear with no long-term pertinence to the rest of the game's plot." And to that end, it can unfortunately be seen as a long-term advertising campaign for Replicant for this reason alone, which just (re)launched recently. The only thing missing was some P2W mechanic or DLC class like unlocking a YorHa job that'd do more damage in the raid to tempt people into buying. The timing of Final Fantasy: War of the Visions also having a Nier crossover on its Global servers shouldn't be discounted for this reason, as well.