I realize that, which is why I also mentioned the contrast ratio. And I meant to say Note 5 when referring to brightness. IIRC the S5 has lower brightness than 470 nits. The reason I look at brightness isn't because I plan on keeping it at full brightness 24/7. I look for that because if I need a brighter screen, it's available. Having dealt with the Turbo and it's 270 nit screen, there are many times outside where with the brightness all the way up, I still have a hard time seeing what's on the screen. Having a display that can go brighter is an advantage, although with an LCD screen you sacrifice true blacks for it.
Yes I have seen that. While what happened with the Moto E is unacceptable especially inwake of them advertising it as a device that wouldn't be left behind in terms of software updates, it is also there lowest model device. Now even though they marketed it the way they did in regards to updates, low tier devices should never expect updates. Most carry lower end specs, and for all we know there may have been an incompatibility with it's hardware. Since Motorola has yet to speak on the matter, we're left with factless speculation. As far as the 2014 Moto X for AT&T and Verizon are concerned, again I believe that is more on the carrier's shoulders than Motorola's. Especially when you consider the 2014 X Pure, which is unlocked, is getting the update. And since they essentially use the same ROM (the only differences between the Pure and the carrier versions seem to be bloatware and supported bands) they could easily update the device. So if that is true, and Motorola wouldn't have much work in getting an update for those devices, who's left? The carriers. I believe that is the reason they went the unlocked route for this year's Moto X, after the debacle that was the Turbo update, and the current CF that is the 2013 Moto X update, they were tired of dealing with push back from the carriers. Since this is the first year they're going this route for the Moto X (besides the Pure/unlocked editions of years past) we don't know for certain, good or bad, what will happen.
But we have no idea on the battery as of yet. The Droid Turbo had an even larger battery on it with a smaller AMOLED screen and it still only just gets me through a day (16 hours of Charger with maybe 3 hours SOT). As far as the slimness of a phone, I'd rather have a device that is more like the XPE in that regard. The curved back has a better feel in the hand (my opinion and shared with many reviewers). In regards to a more efficient display, where are you getting that from? AMOLED is efficient with a dark background, but since they've gotten rid of a dark theme for Marshmallow, a white background will actually be harder on battery life with an AMOLED screen.
In all of this, I was simply giving my opinion on why I'm on the fence. You see it your way, I see it mine. All of it is idle speculation until we get any sort of confirmation (actual reviews of the performance of the 6p and a statement on the update reasoning from Motorola). Until that happens, we can argue till were blue in the face, but until we get some facts, they are in actuality just our opinions.