Not only did they go through with removing Hissatsu: Kaiten, they also nerfed the damage of Midare Setsugekka and Ogi Namikiri. Holy shit.

Including the extra 200 potency from the 20 kenki we don't spend on Kaiten (assuming it's spend on Shinten instead), this is a SLIGHT potency increase on non-Kaeshi Midare Setsugekka, from an average 1138.5 potency to 1160 in BiS raid gear with 25% crit chance and 60% crit magnitude. But including Kaeshi, which did not require 20 kenki for a Kaiten cast, it's a nerf from an average 2277 potency to 2120. That's a 7.5% nerf to one of our biggest burst window GCD combos.

Ogi Namikiri, which is always used with its Kaeshi counterpart, is a nerf from an average 3105 to 2760. That's 12.5%!

This gap only widens under any sort of crit raid buff, as these skills no longer benefit from them. The extra 20% crit chance from Devilment, for example, would buff the average Ogi/Kaeshi combo to 3429 potency, 24% more than the one in 6.1.

A guaranteed crit Midare Setsugekka in 6.1 is going to do less damage than a basic, non-crit Kaiten-buffed Midare from 6.0. It's almost like they don't understand why SAM is fun.