Just for the record, all the guitars I make (well all the acoustic guitars I make) have necks that aren’t attached to the guitar except for string tension. They sort of float in a rotating tenon system.
I can say they are LOUD. For various reasons. And they stay in tune as well as any other guitar. Perhaps better.
There’s a few things I’m doing that all contribute to the volume, but I think there is something very beneficial of not having the neck and the body coupled. Particularly in an acoustic guitar where in most guitars the fingerboard is glued to the top in a way that I think is really not ideal.
Anyway, just my experience. Volume and tone is subjective but that’s usually the first thing someone says when they pick up one of my guitars “it’s loud!”
I am honestly a bit surprised how well they stay in tune with just string tension holding them on, but they do.
In this case, a lot of the innovations are cool but I don’t like the idea that the guitar in general needs to be “fixed” and sometimes people are fixing problems that don’t really exist. 52 Telecasters are pretty cool, don’t fix them. A shitload of complicated proprietary parts that accomplish not a whole lot and would suck to replace or repair (guitars are known to break) has its own issue.
But it’s still an impressive amount of innovation and engineering.
I’ve thought about making guitars with multiple necks but…what’s the point? If you’re actively playing guitar or playing live on stage, you’re going to put one or the other neck on it. You should just get two guitars.
All my opinion…