How thin should a foldable be?

Foldables are complex pieces of tech, and I'm not just talking about their dual displays and flexible hinges. Anyone who upgrades to a folding phone is accepting a certain set of compromises in order to carry what is, effectively, a portable tablet in their pocket. From an added sense of fragility to reduced photo quality, it's a pretty long list you'll need to take on in order to leave slab phones in the past — and that's before you account for the biggest compromise of all: portability.