• Larger OLED screen
• Hall effect sensor sticks
• Better rumble
• Support for 2242 m.2 drives
• Second SD card reader
• Better cooling (I’d gladly have a lump in the back middle if it allowed for a quieter/better fan)
• Better accessory connection options (eg a standard for attaching stuff like extra batteries to the back) - I would prefer this to adding more battery (ie weight) to the unit itself.
• Tweaks to the back buttons so they work no matter where on the button you press
• Some sort of charging dock connection standard to avoid the manual usb connection. Maybe just a usb-c on the bottom
• Small case design change to prevent sd cards being snapped when opening (I haven’t done it, but only by luck)
• Replace the case with a plastic cover to protect screen/sticks (like dbrand’s)
• Fix whatever that weird bug is with the WiFi

Better performance/more ram would be good too I guess but honestly having a unified platform with fixed specs to target has a lot of benefits.