People don't want folding. Folding is the cost paid to get something they do want: a larger screen. What do people actually want in a handheld? They want that roll-out multi-size screen from Earth: Final Conflict.

OK, that was 1997, and it's been done better since then (Minority Report and others...: [1]). But people want the big screen with a tiny carry.

[1]: https://www.theverge.com/2018/11/14/18088620/samsung-foldabl...