Why is Haze a better Drifter than Drifter?

What niche is Drifter going for? I imagine it's something akin to creating quick solo pick offs, invade the enemy jungle, create confusion with his ult to try and separate teammates for picks, move quickly to prevent the enemy from getting away, and do big damage when someone is separated.

Haze does all of these things better, and has the benefit of doing more damage when it's not 1v1.

Her invis is a true invis (not a heartbeat passive) with a 2.5 times faster increased move speed than Drifter if gets if he's lucky enough to be in a 1v1.

Sleep dagger sets up kills better than Drifter's mark with the -1 stamina and sleep time to get into position.

Her fixated stacks allow her to do way more damage to a target 1v1 than drifter can, with the added benefit that it does the same damage when there's another teammate.

Her ultimate has zero activation time, and immediately has an impact on a fight. Meanwhile, Drifter has to sit still for 1 second to notify everyone he's near, and then do 8-20 more spirit damage per attack (aka a few stacks of haze's passive)

I think the biggest problem is sleep dagger being overtuned, but just overall I'm still not seeing what Drifter is supposed to do "better" than haze. I guess infinite scaling? But, again, you have to be lucky enough to get an "isolated" kill to get the equivalent scaling of spending less than 800 souls on a gun item.