What happens when you accidentally get a pebble or grain of sand inside these foldable phones and squeeze/sit on them?
It was only like 6 years ago that leaving your phone in the same room as a running shower was a risky gambit, not sure why we expect ip7 waterproofing on brand new tech.
The dust part is more of a concern because that’s a lot harder to avoid than rain. For example, most people put phones in pockets or bags which not infrequently collect dust. A regression on that is bad for an ultra-premium device which needs a solid market to fund further R&D.