Additionally, the flexible screen is on the outside which will quickly get damaged since it is made of soft plastic. It's too fragile for something that lives in your pocket every day. All modern foldables have the folding screen on the inside to keep them protected, and a standard glass screen on the front.
It slides behind a glass panel on the back, so I don't think that's true.
The whole display is plastic, including the part on the front that doesn't wrap around. Yes the part behind the glass panel on the back would be protected, but the front of the phone wouldn't be.
Yet they still make trifold phones where one of the folds is on the outer side...
"they" being Huawei, and their phone suffers from the same problem, the main display can be easily damaged by dust, dirt, or just your fingernails pressing into it. Notably Samsung's trifold kept the folding display entirely inside when folded, presumably to avoid this problem.