Where is the big breakthrough of foldable smartphones?

They were techniques that became possible at about the same time: 5G and foldable smartphones. While 5G is now in every high-end smartphone and many midrange models, there are still only a handful of foldable phones. How is that possible?

It felt like the beginning of a new era: Royole presented his FlexPai phone in October 2018. In comparison, the first phone with 5G was from Xiaomi and that announcement was two weeks before. They were the two techniques that had to pull the ailing smartphone market out of the doldrums. Since 2016, the growth has stopped.