I'm not sure why some people keep talking about "GTX 1080" performance. PS5 and Next XBox will use a much more efficient and advanced technology, which is not ready yet.
Teraflops alone means nothing. Furthermore, hardware in a close environment can produce far better results than the equivalent hardware into a PC.
Yeah, not sure who staterted all that GTX1080 nonsense, but I've seen it everal times around here in the past. In real life tests 1080 (~8.8TFLOPS) is indeed trading blows with VEGA 64 (~12.6TFLOPS), but that is on PC where nVidia almost always has better bang per flops, not in singular defined console enviroment.
Now, FLOPS are indeed often useless, even real life tests are of somewhat limited usability...only usable thing might be using something like "8x PS4" (which is already weak for 1080p to 4K UHD jump, in addition to usual extra juice required per generation), and GTX1080 level of performance is way short of even that (it's more like 5x).