Maybe I’m just crazy, but I think Reaper may be a sign of giving some normal jobs instant death abilities like Blue Mage, and possibly inviting BLU into the normal scheme.

I say this because other than Marluxia in Kingdom Hearts, Reapers have never really had a basis in Final Fantasy, other than appearing in the animation of Instant Death spells. It would honestly be weird not to give Reaper an instant death skill.

I think in EndWalker this might also be practical in more complex high level dungeons (if they up the ante). Right now everyone knows it’s normal to just pull wall to wall and burn the trash. Well, if endwalker’s trailer is anything to look at, there’s gonna be a lot of trash to fight in the “final days”. With more enemies to kill, Instant death becomes something more of a practical mechanic.