Quote 引用元：SieyaM 投稿を閲覧
So maybe I am misreading this OP but it appears that the primary reason they want to keep this skill is because it is flashy and has a good sound effect, which is nice and all but not a reason to keep it.
They already mention why it's bad from a gameplay standpoint, but keeping the skill because it plays well into the fantasy feel of the Samurai with its animation is an absolutely valid reason to keep it. People will absolutely pick up a class for the fantasy feel of the job instead of gameplay. As OP mentioned as well, the reason the development team removed the skill was for button bloat, which if button bloat was really the issue, then why didn't they address Shoha/Shoha II, Guren/Senei, and/or Ikishoten/Ogi Namikiri. I feel the negatives of removing kaiten outweigh the consolidation of those three set of skills.