The kit is focused on the demographic that places warranty over performance. It is definitely not the best bang for your buck or night and day difference like some options, but if you look at it for what it is, a warranty friendly mild upgrade, it is a viable option.
I’d add that emissions compliance and ECU integrity should be other factors. Californians and others that are required to follow California’s emissions rules (practically all of the Northeast U.S.) should be accounted into the equation. As far as I have seen, no third-party tuner, except Roush and Ford Performance, can generate a tune for total emissions compliance and ensure that their customers can legitimately pass emissions testing. Roush and Ford Performance have CARB E.O. numbers for their tunes. While tunes can be flashed/reflashed to avoid the ire of Big Brother (or your conscience), the odds of bricking an ECU rise with each flash sequence from either a bad tune programming sequence or corrupted software code. Honestly, I’d prefer a one-and-done tune. I have my Volvo XC90 flashed with a Polestar tune. Volvo backs the Polestar tune with a full factory warranty, including extended warranty coverage if purchased with the vehicle. It would be nice if Ford did this as well. I think that they’d sell more of their tunes/performance packs.
You want to know why? Because it doesn't. Didn't you read the post directly above yours? Ford won't cover the parts from the power pack or anything damaged as a direct result of said pack. That doesn't mean it's "voided."
If something happens to your car, and they find leaded race gas in your tank, you run a greater risk of warranty rejection than if they found a little extra ethanol.
The seals in this engine are perfectly fine for E85. You are thinking of older engines, back when the seal material was not correct for the solvency of alcohols. I have worked in the fuels industry and in fuel system development. The only things people need to worry about with E85, is long term storage and deposit formation. Ethanol does have a high affinity for water, but it also binds well with it, so most moisture is just burned in the engine without any issue. You can have greater moisture absorption over months of storage, which could theoretically lead to issues from moisture, but it isn't the norm. However, ethanol does have a tendency to break down and go rancid over time, so it isn't suggested that you leave it in the tank if you have to store the vehicle. The deposit issue is generally caused by the corrosion inhibitors in ethanol fuels. They lead to increased injector deposits and IVD, but this can be reduced or eliminated by using a polyetheramine detergent or occasionally running a tank of top tier 93. Fuel lines and seals are at minimal risk in a modern car. There are other issues, like HP pump roller polishing, that occur when running E99, but that isn't a common fuel for the USA.
The original power train warranty is 5 years and 60K miles. The power train warranty with the FRPP tune is 3 years and 36K miles. So how are we not losing 2 years and 24K miles? Once again, if the tune is so safe, then why is the original factory warranty affected in any way?
https://performanceparts.ford.com/download/PDFS/fpp-warranty.pdf