Another sad SAM making another sad post
For there to be a chance that things will change, you have to speak when you are dissatisfied. And I assume that these official forums are the best chances, however small, to be heard over in Japan.
Removing Kaiten was a bad move, for two reasons.
1) Although theoretically superfluous, it felt to me like an integral part of the SAM rotation and kit. Pressing "buff the big button" before pressing the big button was oddly satisfying, and felt in line with the flavor of the job. It was a thing SAM had that other jobs did not, and now it is less unique for having lost it.
2) The Kenki gauge no longer matters. It could be removed, and charges and a cooldown be added to Shinten, and nothing would functionally change. It was already made less important in 6.0, when the cost of Senei was reduced to 25, but this was it's deathblow.
I am not a hardcore player, but I loved playing SAM and I no longer do. This has made the game less fun for me, and I sincerely hope that something will happen to change that in future updates.