Late to the thread but here’s my thoughts on everything I’d like in a phone. Having just a few of these would make a huge difference in how much I’d want the phone.
Hardware:
Standard features like a 3.5mm jack and MicroSD slot.
Multiple USB ports (especially on tablets)
Thunderbolt port
Here’s a simple idea: Instead of making a thin phone with a massive camera bump, you make a thick phone with the camera flush with the back, and use the extra space for a bigger battery?
User-replacable battery
Modules like the modo mods
Battery passthrough when charging
Upgradable SoC, RAM, internal storage???
Software (here lies my hopes and dreams that will never be manifested):
Starting off simple, a feature that lets you manually limit how much you charge your battery.
Manual over/underclocking controls for the CPU
Separate WiFi/data toggles
More control over how big or small icons and text is
Easy root access with app makers not getting all “you sus” over the fact that your device is rooted