I've played SAM since it came out and XIV itself well before that, the direction this game is going with class design and identity is getting more disappointing as it goes on. It's hard to see the logic behind removing Kaiten, instead of consolidating other buttons that were added 4 months ago(!) so they can have AOE damage with falloff or combo from other actions (Shoha II, Ikishoten+Namikiri.) It mostly shows a lack of understanding. I don't personally know a single SAM player that wants this, and I would suggest to CBU3 to perhaps re-evaluate their thought process on melee job balance and changes.

tl;dr Removing Kaiten is a bad change and I'm unhappy with it. Don't touch it at all, or revert it.