i know my thought will not be the most popular, but i want to be the devil advocate here for one minutes...
because i did read a loooooot of thing about how kaiten is the core of the sam... when it's not... samurai core mechanic are iaijutsu and sen management... kenki is something to weave between this mechanic...
this is the first point i want to adress... what is the core mechanic of samurai. our goal is to generate sen for use iaijutsu it's everything we do... all the rest is here for enhance the moment we will use the iaijutsu. and it will be good to remember this... Fugetsu and Fuka have this goal is mind and is the same for kaiten. they are a means for achieve our goal... deal a massive amount of damage with our iaijutsu.
that said, i want to ask something more simple... do kaiten really bring anything to the table? no my question is bad.... do have kaiten or not will change anything to our cycle? the answer is no... why? kaiten is an ogc that have as sole goal to use kenki for enhance the next skill...
for make simple remove kaiten will not change our cycle. instead to save the kenki for kaiten every minutes... we will use it for something else.
and that the point of my view as devil advocate, one of the most important point. we know a new expansion will come means more skill added... right now at this point, what can be added to the samurai to bring something new without make us have more button added to the bar? right now at this time before kaiten removal i dunno what they can remove without handicap our tools... (i will come back about guren/seinen and shoha 1/2 situation after) the removal of kaiten open room for add new tools to be used with the kenki. for make kenki more active than save up for this minutes windows before use shinten when we can.
kaiten did become a shackle to the samurai kenki usage. instead to have something that allows us to gain more skill to use between our gcd... we did get hold back by it.
that my point at this time remove kaiten can look strange, but if we look at the bigger picture it can open room for more change interesting to the samurai. and it's a big if... i'm not part of the dev team and dunno if it's them goal or not. but if it's them goal i'm for it... because honestly kaiten outside look cool... don't bring anything to the samurai that can't be added by change of potency.
ps: i know my viewpoint will probably encounter a lot of hate... but i'm pratical and pragmatic... i know that nothing can stay like it is forever. even if i did enjoy the change of the samurai with endwalker let's be honest... it was safe add to the jobs, it didn't really bring any new tool outside more diversity to what we can, it's more QoL... yes we did get ogi but ogi is a sort of mini lb iaijutsu. same for the 2 midare, huge QoL like this when we can't use because of mechanic we don't loose time in our cycle.
shoha and seinen/guren... my viewpoint is they are tool for different situation. can they be fuse probably... do i want it? no way in hell! and i feel it's strange to ask to remove tool with different goal instead to a button that can be remplaced by a potency change.