The Tesla CHAdeMO adapter answers those three points:Yes - how is this any less safe than for example the Tesla Chademo adaptor that many Tesla owners use? That also carries much larger current.
- It is a "smart" adapter, with onboard electronics that communicate with the chargepoint using The CHAdeMO protocol and the car using Tesla's protocol to ensure end-to-end agreement on the current to use. I believe it also has temperature sensing to detect any overheating.
- The CHAdeMO plug locks into the adapter and the adapter locks into the car.
- The adapter is waterproof (it's actually filled with potting compound on the inside).