the iphone X has a larger safe space area top and bottom. If you reduce it to the functional 9:16 area it's actually around 5", much closer to the regular iphone.
I honestly hate the Plus UI. I almost never use my Plus in landscape unless I'm watching a video. In Apps, the split UI isn't nearly as useful at is on something like an iPad and the homescreen rotation is just annoying. I really don't get why people are so hung up about this, do people really use their phones in landscape often?