My Story first:
I beat Patch Day Vishap as NIN and faced multiple challenges as Ninja aswell, I loved the NIN Rework in Shadowbringers because everything lined up so well and my first impression of Endwalker's NIN was Gasp and Shock THEY REMOVED SHADOWFANG! and what is Huraijin!?

My Leveling Experience:
I lvled NIN with my Trusts and after a slow start, adjusting to Shadowfangless Ninja I come to grow to come to terms with it and even saw the positives like that I don't need to use Macros for my OCDs anymore because of my Controller playstyle. Now Dream within a Dream is where Shadowfang was before and I'd say NIN is playable but Raiju is a Problem!

I have multiple Problems with Raiju:
1. GCD Double Tap Gap Closer even though Shukuchi still exists with it's Raiton reset trait
2. Raiton proc requirement with a 15sec duration and it's easy to lose those procs
3. as a Result of Point 1 & 2 Raiju is heavily restricting and plays against the general design of NIN Playstyle (in my opinion)

My Idea to Fix Raiju:
Let the Phantom-Kamaitachi perform Raiju instead of the Player outside of Bunshin,
imagine it like this:
NIN does Raiton, gets Raiju proc, presses the Phantom-Kamaitachi button and the Phantom performs both Raiju Skills.
That way the NIN doesn't get restricted mobility like Raiju does now and to be frank, when I saw Raiju in the Job Action Trailer I thought to myself just why?^^ it's sad that this lvl90 skill causes so many problems