"This has to do with "untempering" the 12TET tuning that tuners use."
Well said....
This seems to be about a different issue than how dry or wet we tune the pairs of strings.
So-called "sweetened" tuning schemes are designed to allow instruments designed for 12 tone equal temperament tuning (12TET) to sound more like systems such as mean-tone tuning... in a few closely related keys.
For centuries many keyboard instruments such as pipe organs were tuned to various tunings that were NOT 12TET.
Mostly what bothers string players - I've seen this issue on regular guitar and steel guitar forums - is the 3rds, which is why I mentioned mean-tone tuning.
https://en.wikipedia.org/wiki/Meantone_temperament
"by choosing an appropriate size for the tempered fifths, may produce a perfect major third or a perfect minor third, but not both at the same time."
It's those 3rds that seem to need "sweetening", as long as you play basic chords and do not get too far away on the circle of 5ths.
Just intonation is another system:
https://en.wikipedia.org/wiki/Just_intonation
Anyway, this is a different rabbit hole!
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