Welcome Aboard FusionEB!!Glad to have you here! 
Interesting video that should provoke thought as we mod... and as far as the fuel separating, I'd simply add a recirculating fuel pump system to keep it mixed.. It is interesting that the warning (unsure on the warranty voiding) is for pre'12 vehicles.
I lean toward what 4DR said. First, Ethanol is NOT corrosive... Geez, we drink it...(sometimes too much, LOL). It is drying, which can be a double edged sword... It get the water out of your fuel system, but it is possible that manufacturers are using cheap seals and gaskets that fail if dried. The ethanol does not have the lubricity of gasoline, but neither are like diesel and we do have pretty sophisticated oiling systems these days..
As far as detonation, which can ruin engines.... I'd like to see the autos and claims. The ECM in them must be pretty bad... It's supposed to sense the conditions (regardless of fuel) and prevent damage at least in the Ford EB engines, and will shut you down to prevent damage. There are a number of threads here with that discussion.. usually WOT at high rpm near the top of second gear in the SHO.... unrelated to fuel type though.
4DR ran E85 in a high WHP (600+) 2011 Flex 3.5EB.. got more power from it, raced the car (hard use), and had no problems.
In Arizona they add 10% ethanol to all grades of gasoline in the winter anyway... it's right on the pump and you don't have a choice. In the last 37 years I have driven Ford in Arizona without a hitch...trucks, cars, crossovers
I'll certainly keep watching the issue, but I'm far from convinced.
I believe other factors are at play in the mix.. and one is surely the desire to shirk warranty responsibilities.
Sorry about the rant.. And again, WELCOME!
