Players enjoying the current iteration of Job is "troublesome" because it makes the future rebuilding of the Job complicated
This is one of Yoshi-P's comment regarding the Samurai changes in the patch note reading, paraphrased from the translation provided by the ffxiv reddit discord, relevant excerpt below.
"people who say that it wasn't a trouble at all must be really used to the job by now, I think...oh dear, this is really troubling...hmm...I do think it's easier to not change it at all...now what do I...oh well this is troubling...I know I won't get away by avoiding this so I do look at various comments here and, hmmmmm....whether it's okay to change...well to the person who like that kind of troublesome at hand is easy to read I suppose. I mean, they've been really fond of the job for quite a while now... But if we continue this then we won't be able to change anything and if we pick up and rebuild again it'll cause more complicated experience than it's worth..."
The last line "これ以上立て直ししていくとまた複雑体験になっていくんだけどな" is closer to "if we add more to what the job already have, it will become too complicated.
This is a false premise.
First off, the "future addition" to the job hasn't happened yet, and most likely will not be taking place until 7.0 in 2-3 years time.
And more importantly, the future addition does not have to be complicated, if some actual thought and effort is put into it.
Take Black Mage for example, the main new ability is Paradox. It is one skill, it does not add to BLM's existing hotbar (you can even take Blizzard 1 off in most scenarios now), it introduces quite a bit of depth in high-end BLM optimization, but it is also just fun to use in a "normal" rotation.
Or look at Jobs like Machinist and Dark Knight, where their new addition being simply a new skill for more damage, with no changes to their core gameplay.
Then you have Gunbreaker, where the added 3rd Cartridge and Continuation to Burst Strike have caused players more grief than gameplay satisfaction.
More is not always better, and making deletion changes now when the "future that may or may not be overly complicated" is still far away is a flimsy argument.
And personally, to disregard the feelings and feedbacks of the players who loved the job for so long, does not sit well with me.
I have some more technical arguments I can make regarding why the removal of kaiten undesired, but I'm too emotionally charged at the moment to voice them properly.