Okay, Let me break this down.
First off, You're argument of "Just get a dual RX480 ;)" Is simply invalid. 1 benchmark from 1 youtuber does not equal a entire community. Its like saying that 1 result means that all results are invalid. No, It just means 1 result is different than other results and the majority says something different.
Lets go over components of the RX 480 REF x2 vs the GTX 1080 FE. First off, what its made out of. As we all know the RX 480 has a 6 pin connector compared to the 8 on the 1080. I won't address this however as a positive for NVIDIA since people argued that the custom boards with a 8 pin and a 6 pin is better than a 8 pin when results in some cases proved different ie: JayzTwoCents. The Chipsets. On the NVIDIA Side we have the Pascal along with 2560 CUDA Cores. On the AMD Side we have the "4th Generation" Architecture along with 2304 Stream processors. I can't exactly judge 2 different CUDA/Processors along with the Architecture since those do not impact performance. What i can judge however is how much PSU consumption it is doing. The GTX 1080 FE does 180w. The RX 480 REF does 150w however since were comparing the NVIDIA Card to the crossfire configuration, thats 300w. That isnt even mentioning OC. Which while yes Overclocking on a REF or FE Card really should not be done, Would bring even more watts to that number. As for memory, The GTX 1080 FE ( or any 1080 ) Has 8 GB Of GDDR5X. The RX 480 has the 4GB GDDR5 along with the 8GB variant. Now you're argument was that you can "Unlock" the RX 480 and get 8GB on the 4GB variant. I wouldn't bet my wallet into that however. What if the card worked with a bios update that claimed that there was 16GB on the 8GB model, when in reality it simply doubled the actual memory to make it look like its 8GB of GDDR5? Until theres numbers comparing the 4GB model, Unlocked, and the 8GB model, I wouldn't bet my money on unlocking the card. Furthermore even if it did work, what would happen if the card happened to break down due to bad design or overheating? If you were under warranty you would literally have to send the card along with your receipt showing you ordered warranty under that product to the warranty company (AMD,SquareTrade,Asurion,WhoeverWarrantiesYourCard,) And when they try to test the card, they will find out the BIOS has been changed to the 8GB variant. They will send back the card claiming that there was a software modification and thus they cannot fix the card. So instead of spending that $40 - $50 Bucks on a 8GB variant, You have to spend $199+ On a New one. And even if it was 8 GB, Its GDDR5.. Which Would be worse than the GTX 1080 still due to it being GDDR5X. Material: Theres no question, The GTX 1080 FE is made out of a alluminum along with glass compared to the plastic and the non fancy look. Now does that mean the AMD one doesn't look nice? No. In fact i think both in aesthetics are very good looking (Although if we are comparing REF to FE Then one flaw would be that the REF from AMD does not have a backplate). Its just that if i was to judge on material, NVIDIA wins.
So for the GTX 1080 FE compared to the RX 480 has 2 more power connectors (Not a positive for NVIDIA just putting it here), More Efficient PSU consumption ( If you don't have powerful enough of a PSU then the cost goes up! :] ), Memory is better due to AMD's cards shady practices with the BIOS, and even then NVIDIA is better thanks to there GDDR5X, And NVIDIA even wins in material.
Now, you might of seen that i didnt mention the PSU problems via the pCie slot. You mentioned that "every card consumes more ban 75w from the pcie" Well then, why doesn't a 9xx/10xx or in fact the entire pc crash when its exceeding that limit? As Science Studio Proved, he had crashes in the middle of the benchmarks with the RX 480 on older motherboards. Furthermore, even if it will be fixed "with a BIOS update" it still in some ways doesn't excuse it. Why i didn't mention it however was because simply the power from a cable can be increased from 6 to 8 or 8 + 6 on custom coolers, however you criticized the GTX 1060 FE for having no SLI bridge. and why would they? Its A Founders card its terrible at overclocking compared to a Custom Board. To Put it simple, I think that a SLI bridge will likely be added on the custom boards. You're argument on NVIDIA not having a SLI bridge is hypocritical to the power issue that will be added on the custom coolers.
Now, I am not a NVIDIA Fanboy, in fact in my arguments i even showed the things that are equal with the cards. I did not even mention the benchmarks due to them varying. I'm just disproving your arguments regarding AMD. We might disagree, but the truth should be shown.