When I read the headline I thought it meant it was also not viable for PCs either, which doesn’t seem to be the case at all. Most PCs have at least 16GB ram these days.
Also keep in mind that PC doesn’t have unified memory. So there’s usually at least 8GB of VRAM in addition to whatever amount of main memory you have.
For one viewport!
The problem with Series S is split screen.
Also that’s 6GB of dedicated VRAM. Consoles have unified memory, so you need to fit the OS and the non-graphics memory in there too.