I plan to avoid situations like that, but curious if there is an absolute quantifiable "sweetened" tuning or a case of fine tuning until it just sounds right?
Grant
There is no doubt that this a really good tuner, packed with useful features.
The 'sweetners' would be a thing of taste as there is no preset 'sweetner' for a fretted instrument.
The octave will always occur at the mid-point of a sting, there iis no getting around that simple fact. As you know you have to adjust the bridge to get that mid-point to occur exactly at the 12th fret.
Of course that position will slightly alter using different gauge strings, prefer a higher action and to some extent because of the arching of the neck so you have to adjust the intonation after changing one of those types of setups.
Although guitars are built to very fine tolerances there will be differences introduced by slight variances in the fret spacings, fret wear which will cause the string to make contact with the fret in a slightly different position for example. Again the choice of action you prefer will also make slight differences as there is a certain amount of tension added by fingering against a fret vs an open string.
You already
know all of this.
No sweetner is going to take all these tiny variances into account in a meaningful and repeatable way on a per instrument basis.
Sweetning could work if say there was a way of a guitar that has already been adjusted for intonation well and tuned, if it then measured the discrepancy between 5 and 17th, 7 and 19th, 3rd and 15th frets It could then caculate an average offset for the entire string length down the fingerboard giving you the best compromise to get perfect pitch all the way down (error diffusion). That's not what is happening here, you choose a preset for GTR which likely takes a best guess at that idea from a 'standard' guitar as if there is such a thing.
IMO, sweetning is best done when you choose a guitar and it 'sings' to you when you play it.
As I said it's a fantastic tuner with great features even if you take the 'sweetning' thing as a novelty sideshow which IMO and for the reasons given on this thread, it is. Of course there are some that will swear by this feature and on the odd 'typical' guitar (if there is such a thing!), it will nail it.
Conclusion: A great tuner even without the marketing magik of the sweetening idea.