After reading the patch notes, I guess I won't play SAM anymore

[Quor]

The problem is its a HUGE swing for SAM due to the potencies.

Then they can tweak the potencies, or add auto-crit to Kaiten (which won't affect Kaeshi's, meaning group crit buffs still have strong value with SAM's while simultaneously smoothing out damage). They had other options but they chose to gut the job by removing Kaiten and adding unnecessary auto-crit.