I don't get the use case for thin phones, and believe it's just marketing-driven preference. We're told thin phones are better over and over, and slowly the market starts to believe it because the message is saturated and there's no counter-message to it.

It couldn't be that thick phones are heavier to carry around. The difference between a 8mm phone and a 16mm phone couldn't be more than 200 grams or so. That's making you sweat as you carry it? It couldn't be that it's tough to hold up to your ear. My Nokia 7210 was probably one of my best phones ever and it was by today's standards a thick brick. Google tells me it was a whopping 17.5mm thick. So what is it? What practical benefit do you get from a thin phone? The only thing I can think of is the ability to carry it stealthily in your pocket, but is that really the driving use case?