More to Joe Monzo

>Chords can be tuned
>in JI with a variety of ratios that are close enough to a "target"
>that many of these ambiguities can be explored rationally.

Yes, Joe, you are correct about that, but it seems that you may have
been implying otherwise in your post about tritones. That is, I don't
think 64:45 can itself be a "target" but is instead close to several
possible targets. Other notes in the chord can clarify which target that
is, and in the case of dominant seventh chords, only 7:5 can fit with
all the other ratios to define a simple "target chord".