My point, such as it was, is that a lot of engineering falls under best practice, design codes, reasonable estimates, rather than actual solid facts.
Obviously it varies according to discipline. Somebody designing a plane has a lot more confidence in the details of what they're doing than a...
I don't know what kind of engineer you are, but I haven't seen a verifiable fact in about 10years.
Lots of sweeping assumptions, best guesses, models and "engineering judgement", but no facts. Can't be having with those.