The way they went about everything is really weird. This is how I would do it if my job description was different:
I'd give Armor Crush a damage over time debuff just like how Paladin's 1-2-3 combos work, that would give a fresh new direction to the depth of the job and restore Shadow Fang in essence. Also I would remove its Huton refresh component, so Huraijin would have a real purpose, not talking about potencies, since it is a necesity they could balance the entire game about NIN having 1 gcd where it does x damage because of y, it is not relevant, since they went with the idea of implementing Huraijin the Huton extender has to go. Since Armor Crush becomes a thing on Lv. 54 which is Heavensward area, the ability that can refresh Huton without reapplying it would remain in Heavensward since Huraijin is Lv. 60, I think this is important because new ninjas basically hate their lifes manually refreshing Huton mid fight with a ninjutsu stack. I would also restore Assassinate as how it was, but I would make it same button separate ogcd combo just like how GNB's cartridge was simplified for Endwalker because SE is validly concerned about a job having too many buttons, console players and all that. Keeping the root effect of course, since it had a combo timer and only thing we had to do was to fill it into Trick Attack not worrying about cooldown misalignment and such we can delay it if mechanics would punish us for it and also I dont want to ask for everything.

Rough ideas, didn't really plan potencies and how our Lv. 90 balance would go, but at this moment 60-89 is a barren wasteland (only from 60 because 1-59 is a barren wasteland by design), I really don't know how 90 feels like but even if it's fine on 90, it is not acceptable that only 1 iteration of a job is enjoyable and everything is a drag. I feel like NIN has lost its fast paced, many buttons playstyle. I always played the most complex and difficult melee classes in every mmo that I touched and I feel like ninja is not that anymore.

Sorry if come down as naive, clueless and inexperienced about how new expansion tunings/job changes work, this is my first new expansion because I started in ShB. Might count as a different pespective.