Hey guys first post!
I don't have an opinion about the Raijus yet, I only know that Ninja "feels" much weaker and boring to play compared to how it was in Shadowbringers. In our burst window we barely have any buttons to press even though it was said by the devs ninja will still feel busy, but it doesn't.
A GNB opener is infinitely more busy than NIN while it is just a tank which is not right and many people seem to forget that one of the best selling points of this game is that every content is kept relatively up to date and somewhat relevant with the level sync system. Yet NIN right now for example on lvl 60 feels atrociously bad to play.

Shadow fang was a launch and forget ability into our trick window but at least it was something we had to press and align with the 5% damage buff and it was also great source of damage on lower level synced content, which we lost for the sake of losing, not coming back and no replacements given. -1 button

Assassinate was annoying at times sure, still we could press it and it was free on demand damage and if we died to it, it was our fault. Got on lvl 60, now got on 40, nerfed to the ground between lvl 40-56, replaced on 56 with dwad. Second -1 button

I don't really want to talk about what's and what is not worth to press, as I saw Phantom is situationally obsolete to the 1-2-3 combo, in my opinion Huraijin is a dead button created for new players so NIN is not that punishing on downtime/death, I don't know... I was always able to press them 3 mudras to refresh Huton and eat the penalty if I messed up something... and the Raijus... idk tbh, seemed cool on paper but the theories about them seem sound, maybe the devs expected ninja players to walk a fine line between chasing lightning damage potencies and giving up Raiju combos for more ninki gauge, I really don't know.

All I know that my burst "feels" weak and boring with Shadow Fang and Assassinate being removed, I always enjoyed to press my Trick Attack->DwaD->Shadow Fang->Assassinate double weave combo and now it's gutted and gone. Maybe we need the 2 second in our trick attack window for Raiju on lvl 90 or something, but what about anything below that? My lvl 60 synced POTD Ninja is a barren wasteland, we have our occasional ninjutsu, 1 minute CD DwaD, 2 minute CD Mug (which I still don't know why we have as it is before Enhanced Mug trait on lvl 66, the whole 150 potency every 2 minutes doesn't make sense), 1 minute CD Trick and the 1-2-3 combo and Huraijin hurray, probably the only content it has any use tbh (sorry I hard cringed during the job showcase when they introduced it, I just can't stand this button...)