PC is already currently separated, but I agree Wii/WiiU and current gen version (PS4/PS5/Xbox) should be separated for the reasons bajo has listed.
I feel like it makes more sense to lump the current gen versions together unless something is found to demonstrate a big difference between them since there are not that many runs...so we would have a lot of categories with only one or two runs. In the case of Fatal Frame 2 the Xbox version is known to run considerably faster, but I have no way to test this for Fatal Frame 4 as I only have the PS4 version. If someone has the Xbox version of Fatal Frame 4 feel free to chime in. But if there is a big difference found I 100% have no issues with having current gen console versions separated as well.