I think we should recognize the importance of time. I have change my whole political position through my life, I was an right-wing liberal, conservative, even Catholic ! I then met people with different positions, that were willing to have good faith discussion about political disagreements.
Did I change my mind during these discussions. No, of course not. But were there useless ? Not at all. Several years were needed for me to destroy and rebuild a new coherent vision of the world.
Also, we have to recognize that this process can be painfull. If we are talking about individuals, caring about the impact our discourse on their mind is not only kind, but also a key part of an efficient strategy if you hope to change someone’s mind.
(That of course does not apply to structures, that by definition don’t have feelings. Or allegories of such structures. I will happily call Elon Musk a de facto murderer asshole if talking about capitalism through his figure. But if I had a sincere discussion one on one with a literal capitalist, with the hope to change them, that would rarely be a fruitful strategy. Unless shocking them seems efficient.)
Anyway, even if I sometimes (often ?) disagree with you, I hope I will be able to hear what you have to say and that you will hear the critics, so that we both slowly move towards more a precise and pertinent comprehension of the world.
I kind of agree with your 2 last sentences. But you don’t have to simulate the whole universe. You just have to compute an approximation that would be credible to a single subject. And that is a much much much lower bar. You can make gross approximation about the large majority of the universe without the subjetct being able to detect this !