Scientific Progress

[Mark Knowles]

many of these theories include opinions that cannot be measured (are unfalsifiable)

I was specifically referring to opinions, and those that cannot be measured. Referring to the wiki page about the scientific method, they do not allow to define experiments from which we learn more about them.

Examples: anything related to the intention of the author(s) / scribe(s) / artist(s).

One could in the future discover a document written by the author stating what their intention was or there might be more indirect evidence as to their intention. So this isn't necessarily unfalsifiable, though when all the evidence is assembled we may only be left with speculation as to their intention.