Random chance allows for emergent storytelling, if you were truly as “intellectual” as you sell your arguments to be then you’d at the very least try to understand why so many people find value on such randomness.
Taking chances is not devoid of strategy. And having to work to give yourself the best chances possible can also be part of a gameplay system. It’s why irons can still be used even though steels are also readily available usually after a certain point. Sure sometimes it can go a bit far like with FE6 but that’s still an a facet of the system being taken to an extreme that just so happened to not have worked in that environment.
If you’re not playing casual mode you are acknowledging that you can either be forced to reset or fail your Ironman because of the odds swinging out of your favor. That’s part of what makes such playthroughs so exciting for so many, it’s an interesting dichotomy of random chance and pure numbers.
Removing chance also just makes it REALLY REALLY boring. If you can plan your entire run from the word go then there’s no hype moments of 1% crits or units being blessed by the RNG gods and somehow surviving a lethal enemy phase, it’s taking the human interaction out of these games. There’s also the factor of getting screwed over by the RNG being absolutely hilarious in retrospect.
Assuming you’re not lying about your Ironman failing bc of a 99% miss and 1% crit… That’s fucking sick, that’s absolutely incredible I would laugh my ass off if I saw that with my own eyes! It’s such a waste to disregard how comedic these games can be!