Yes, the definition of "fact" in "findings of fact" is "there is a factual answer, but we do not know what it is, so we have to guess".

Yes, it might be better if jurors were all acquainted with Bayesian reasoning and it would definitely be better if things like expert testimony and so forth came with confidence estimates.

And yes, "beyond a reasonable doubt" is pretty qualitative.

My point was that if you are expecting your jurors to have a deep understanding of the law, you are definitely doing it wrong.