Whenever I boggle at the high price of flagship phone I have to remind myself that the Motorola DynaTac 8000X cost more than $10,000 when adjusted for inflation…
Maybe not a phone, but that design did work out well for the Nintendo DS.
I’d trust a phone folding about as much as I trust a skylight not leaking.
But people usually like to keep their windows for 20 years or more, whereas they tend to buy a new phone every 1-5 years.