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> If it's not broken, don't fix it.

I understand that way of thinking for a small business computer system. Not for a critical infrastructure. Also if people actually thought about like that we would still be in stone age, like why invent something new or use a new technology? Keep on using rocks to crack nuts and kill animals

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I think you can imagine the difference between “I did some work and made this thing that is clearly better, but we might have a few kinks to work out” and “I did some work, and if I did it perfectly, it’s just as good as the old thing, but we might have a few kinks to work out.”

I agree with you. First, "broken" is not a binary, it might not be broken but it might not work well either. Second, sooner or later everything breaks, and you better be ready for when that happens.

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