For one, the locking component, that prevents yanking the handle out while 350kw is flowing through it (an obvious arcing and fire hazard), is on the CCS handle itself, vs NACS where the charge handle just has a small hole and the locking mechanism is part of the car.
This plastic locking mechanism on a CCS handle can break if it's abused, leaving it in an unsafe state to use
I haven't seen one made of plastic. All the ones I've handled have been metal.
The locking mechanism can also break on the car. Its way more challenging to fix. Also, I'd prefer to always be able to quickly and easily manually unlatch it, which isn't true on a Tesla. On most models the manual release is tucked pretty deep in the car.
This plastic locking mechanism on a CCS handle can break if it's abused, leaving it in an unsafe state to use