Putting a name on a century-old concept isn’t the worst idea because now we can easily refer to it when it happens once again. And yes, the old age of that problem is why I consider it a bit of a rabit-hole. It’s not just something Twitter does now or that tech companies do now because they copy from each other. It’s a quite old concept you’ll hear about again and again and can read up on quite a bit, if you really are interested into more than the basic concept or why companies keep trying even though the outcome does not always see positive (from an outside, users perspective).
The GPU of the series S is simply a lot worse, socutting quality by a bit won’t cut it. I also suspect that since they always quote the split screen as problem, it might be about the number of textures to be loaded in when the game is kind of running twice, not the quality.