I think the test, again we are talking about quite a lot of months of additional work (which you are discounting), will be a PC with 8 GB of RAM and 4 GB of VRAM max (keeps the Windows tax in check and is fair to how much free VRAM you would have for graphics only on PS4) and bandwidth, 8 cores Jaguar like CPU specs (or a bit more since yes you are running on Windows), and a mechanical <7000 RPM HDD and then see what the cuts are and what the performance is.
You want to talk about a PS4 target, put it in the same conditions. If you talk about 16 GB of RAM and 8+ GB of VRAM and Ryder 4 cores then we’ll, you are winning against your own strawmen and you know it…