Scribes and authorship of the text

[Koen G]

I think the identification of languages and scribes should be done on measurable, repeatable criteria. The argument from authority (Currier languages, LFD hands) and subjective statements have little to no value.

When it comes to LFD, she is the right kind of authority, as opposed to Currier (who still had good intuitions and observations in my opinion). Besides, her argument does not follow from authority, but from the kind of analysis that is common in paleography. This includes a subjective component. Paleography is typically one of those subjects where you find handfuls of scholars hyperfocusing on extremely specific subjects and disagreeing with one another.

That said, I like your suggestion of a more testable, repeatable approach, which I have also considered. I'm not sure if it would change anyone's mind though. Objective measurements may not be able to capture all the nuances that define someone's handwriting. And at the other end of the spectrum, people who already think of "The Author", will just say that he wrote differently at different times of his life.