Some current benefits, some future benefits.
Current advantages:
1) Do not install a plug, cleaner that is fully sealed for indoor or outdoor use in all weather conditions.
2) You can use 2 wires instead of 3 wires plus ground wire, saving you 1/3 the cost per foot of running the wire.
3) No separate FI circuit breaker required on the circuit if the wall plug is hard-wired as intended. Since the National Electrical Code (NEC) was updated in 2017, new 14-50 sockets require an RCD when used to charge electric vehicles. These cost around $ 100.
4) Can be configured on a 60A circuit. When installed in a 60 A circuit, the wall connection allows charging with up to 48 A. Otherwise, the wall connection would allow charging with up to 40 A when installed in a 50 A circuit. (The Tesla Mobile Connector is limited to 32A whether it is installed on a 40A or 50A circuit. The wired Mobile Connector has a fixed 14-50 plug and supports charging up to 40A. )
5) As a permanent EVSE as opposed to an EVSE that plugs into the Wall Connector, you will receive a US federal tax credit of up to $ 1000 or 30% of the cost of installing the circuit and chargers all in one House. (See IRS Form 8911.)
Future benefits:
1) Load sharing to allow two or more wall connectors to be installed on a single circuit. (This requires an unreleased Tesla firmware update for the Wall Connector.)
2) Tesla has indicated that the Wall Connector could support direct billing. (This, in turn, would require Tesla to release a firmware update for the Wall Connector and require an internet connection and WiFi. This is best for commercial installations such as a B&B hotel or parking garage.
Restrictions:
1) The charging cable is only 18 feet long. For maximum utility, IMHO, an EVSE charging cable should be 24/25 feet long.
2) Firmware updates require an internet connection and WiFi (Note: WiFi / internet access is not required for initial configuration, only wireless updates.)
3) The front panel of the wall plug is made of glass. Seriously, who would do that other than an EV company selling glass roofed vehicles? In another dimension, a major EVSE manufacturer has a video showing that the aircraft-grade plastic used in their EVSE housings is tough enough to hit with a wooden mallet. (In the video, the wooden bat actually splintered when used to hit the EVSE case, while the EVSE was left undamaged!)
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