Screens are already getting too big for one handed operation, and the main use case for a folding screen is get a bigger screen, with more moving parts

Every once in a while I think back to how convenient my old flip phones were and wish for something that small with a modern sized screen, but I can’t see that happening and I don’t miss hinge failures. Moreover I wouldn’t want to go back to thicker phones

I guess you could be thinking of phones with two screens so you could do basic functions without unfolding but it seems like a lot of complexity. It’s great if that seems useful to you …… admittedly I already bought into both a watch and a tablet so see less need for either a small secondary screen or a larger screen