Reposting a short version of my main thread.

Instead of bickering about subjective measures such as aesthetics or depths of the skill, let's examine Kaiten with the scope of Action Bloat in mind using CPM as metric.

In 4.x, Samurai use Hagakure to eat Sen and spam more shinten, Kaiten is not action bloat
In 5.x, standard 1 min rotation uses 4 Kaiten per min, no compaints to Kaiten being action bloat.
In 6.0, Meikyo charge adds 1 extra Kaiten on opener, and Ogi 1 extra kaiten every 2 mins.

In ShB E12S P1, top 3 SAM had CPM of 47.6, 47.8, and 47.1
In EW P4S P2, top 3 SAM had CPM of 46.1, 45.3, and 46.1

Top P4S P2 log had 33 cast of Kaiten on 6:43 kill, that's 4.9 CPM. That's equivalent to 660 Kenki or 26.4 Shiten Casts, which is 3.93 CPM. It is barely a change, and EW SAM already has lower CPM than ShB SAM, the action bloat arugment does not stand.

No Action Bloat = No need to remove Kaiten.