The word truth in of itself can have different meanings that are not exactly the same.
If we were to throw the word out and use some other meanings in its place, it may change our discussions.
Is it fact?
Is it reality?
Is it authentic?
Is it the opposite of falsehood?
Again I think we all take a word and try to squeeze it into one meaning. We (and the witnesses) can get into semantic debates about "truth", but should we? or should we take everything piece by piece then apply what kind of truth we are trying to associate with it.
otherwise you get into these practices of silly details. Is the sky blue...yes... what about at night...no...but you said yes... i meant during the day looking up from earth on a cloudless clear day... OY VEY
there are many truth theories, and if a witness ever played this card, you just need to stop using the word "truth" because as we already know, witnesses have their own proprietary definition of what that word means, truth is whatever they say it is right or wrong!.
607 doctrine, is it fact/reality. NO!
and on and on and on