Hi to everyone. I agree with your idea of a compact nothlng phone. I believe 5.4 to 5.7 inches would be great.
On the other hand, I understand that small phones are not a lot profitable right now, but they could be with a good publicity.
In my case, a can’t move one arm, I have a disability and a compact phone is really usefull for people like me, who only use one hand. I invité you try using your smarthphone with just one hand, no more, one hand when you are walking.
Right now, just iPhone, Asus and google have some compact phones, but the iPhone 13 mini is the most easy to use.
Keep in mind that compact smartphones are a great choice not just for the normal consumer, they are necessary for people with some disability. Sometimes we need un think out of the box.