As a former 614ce owner, when seeing the video guitarsan just posted and hearing that last strum as the video ends, I heard the revoiced 6 throw more bass than I could have imagined Maple ever could. It sounded beautiful to my ear.
And, after following this thread closely, and hearing the two sides of the discussion (which I have enjoyed immensely, I love it when really smart, knowledgeable people present their viewpoints, even when they disagree), it's hard not to see the validity of both sides.
Clearly Andy Powers is trying to change what has become the traditional voicing of maple, as well as the aesthetics (of which, the new asthetics I love because of the proximity to the stain of traditional stringed maple instruments such as the violin, viola, cello, etc.), efforts which Taylor hopes will give Maple a broader appeal. But I can see how Maple traditionalists enjoy the brightness of maple, especially in acoustic/unplugged multiplayer situations where they want to cut through with lots of sparkle say where there's a bunch of boomy rosewood dreads, or do the same in a band/plugged in environment where maple can still cut through bass, drums, etc. while managing overtones.
In my view, this is really the crux of the matter, and Taylor was willing to leave behind the old brightness for this new version, perhaps because they know just a little eq in a band situation will still allow the new maple to punch through with brightness, while the essence of maple to limit overtones remains (as compared to rosewood).
It is also amazing how much changing the back bracing to taper away at the sides (you can see that in the video) immensely impacted the tonality. Over the years I've watched you more knowledgeable fellows discuss the impact of the changes Taylor has made in top bracing, hearing the difference the bracing changes to the back have made only makes sense, as well as thinning wood thicknesses and veneer.
This whole re-voicing experiment with both the 8 series and the 6 is incredibly interesting. One day, I hope to have the time and wherewithal to make just one guitar myself, as some of you on the forum have, and to experiment with all of these variables. Fascinating.
Funny how nothing I've said resolves the issue at hand, which is, which version is better? That's up to each listener, as so many of you regularly surmise.