1) My Bluetooth over-ear headset can also do 3.5 mm. Detachable. My smartphone can do USB-C to 3.5 mm.
2) In-ears are comfortable to lie in bed with. Cables are unsafe here (compare with 'lost of earplug' argument).
3) Batteries need to be user serviceable (see iFixit), but so should cables be. See my point #1.
4) Not all Bluetooth protocols are equal, and pairing is a matter of a couple of seconds just like taking the headset or attaching the cable.
5) You can also make a wired headset wireless if the cable is modular. Small 3.5 mm to 3.5mm or USB and then usb2bt with a battery.
6) All headsets require maintenence in form of cleaning or replacing the (fake) leather.
7) Bluetooth has security issues. Tracking, for example, but also the stack is a security nightmare. You generally cannot physically replace the Bluetooth chip on client or peripheral, as they're usually baked in the hardware (e.g. in WLAN chipset of smartphone, tablet, laptop). Sometimes it is possible to use a modular device such as USB-C/USB-A. Then you can replace or add a stack.
2) In-ears are comfortable to lie in bed with. Cables are unsafe here (compare with 'lost of earplug' argument).
3) Batteries need to be user serviceable (see iFixit), but so should cables be. See my point #1.
4) Not all Bluetooth protocols are equal, and pairing is a matter of a couple of seconds just like taking the headset or attaching the cable.
5) You can also make a wired headset wireless if the cable is modular. Small 3.5 mm to 3.5mm or USB and then usb2bt with a battery.
6) All headsets require maintenence in form of cleaning or replacing the (fake) leather.
7) Bluetooth has security issues. Tracking, for example, but also the stack is a security nightmare. You generally cannot physically replace the Bluetooth chip on client or peripheral, as they're usually baked in the hardware (e.g. in WLAN chipset of smartphone, tablet, laptop). Sometimes it is possible to use a modular device such as USB-C/USB-A. Then you can replace or add a stack.
Each has their pros and cons.