Warzone firefight difficulty?

It seems to me that it’s even harder than legendary difficulty, enemies are damage sponges while Spartans drop like flies.

Why is this? Shouldn’t it be heroic, the canon difficulty?

Heroic is not canon, it is simply “the way Halo is meant to be played”, which are 2 different things. The reason why it is tougher than Heroic in Warzone Firefight is because Heroic wouldn’t be a challenge for a full team of Spartans(players) and if we go by lore-wise reasons I’d say they just put a tougher difficulty for Spartans to train on.

It’s just a bad mode to solo queue for. Which sucks for me b/c 90% of my Halo is solo these days.

It sure feels a bit too difficult at times, but it also feels appropriate at the same time.