i feel the removal of kaiten is more because let's face it, it was bland in terms of gameplay, yes you had to manage the kenki but at the end it was just you press another button before launch your midare/ogi. and i feel they did wanted to make place for more kenki skill since adding more gcd skill for the samurai feel difficult right now.
however, i feel they did goes wrong with the feeling of the jobs in terms of damage and impact of the midare/ogi, without forget the huge nerf of tenka goken.

i admit the idea to make ikishoten become ogi... since day one of endwalker i did feel weird it was not there from the get go.
the idea to make shinten and kyuten becoming seinen and guren when you use ikishoten is an incredible idea! and need to become a thing.

but i'm against the loose of shoha 2 since the two are skill that have 2 different role... one is for mono target and actually hit really hard with the nerf of midare. and the other one is for group fight.

more than the loose of kaiten... i feel they need to work on more synergy between gcd and ogcd skill. the pvp rework of the sam is insane for this between the chiten/zantetsuten synergy or even the charge + combo synergy i feel it goes in the right direction.
i have always regret the loose of skill to use after third eyes and now... on one side i'm happy they did remove kaiten because it can open for room for kenki usage and at the same time i feel conflicted with how the whole sam feel right now.