Also because you can always lower settings or throw better hardware at the problem on PC so even a badly optimized port should eventually run acceptably. But if you fuck it up on console, you get Cyberpunk on the PS4 and have to spend a ridiculous amount of time and money to make it work.
And this is Bethesda we are talking about, at this point I wouldn’t be surprised if the PC versions are designed from the get got under the expectation that the modding scene will come to the rescue and fix everything for them no matter how terrible their work is.
Probably based on what the actual monitor resolutions are and not just the raw multi monitor result as you can create an almost endless variation of those when you start matching the resolution position based on the physical location of the monitors.
E.g in a setup like this even if both would be 1920x1080, you’d end up with something random like 3840 x 1428.