I started using Bluetooth headphones last year without special reason. I am not coming back to 3.5mm headphones, wires are so annoying when you are doing something else and they are in the middle.

So you have people like me and a lot of people that never use that connection. And I guess a lot of people buy the phones based on the feeling when they catch them, and thinner phones feel better and people are more likely to buy them. Thus say bye to the 3.5mm connection and loss the hope for bigger batteries. Buy trends is what matters for business.