In 2017 the NEC was updated to require a GFCI on a 240V/50A circuit with a receptacle and plug such as the NEMA 14-50. The reasoning is that although the EVSE already has GFCI capability this does not detect ground faults at the power plug end, only at the J1772 charging cable end of the EVSE. A GFCI circuit breaker will help prevent the user from being electrocuted while plugging/unplugging the power plug. My electrician, who installed my NEMA 14-50 receptacle prior to 2017, did not think the GFCI was necessary in my NEMA 14-50 installation, inside my garage, when I asked him about it. It is however, now part of the code. Why not for a oven or a range; because you hardly ever plug and unplug those appliances. Also, the NEMA 14-50 receptacle can be installed outdoors (with a covered enclosure). I recall reading that outdoor use of the NEMA 14-50 was only approved for temporary use such as when powering a parked RV motorhome while the NEC considers an EVSE to be a permanent installation. It would makes sense that the GFCI would be required on NEMA 14-50 receptacles installed outdoors; there may have been cases of people getting shocked while plugging and unplugging 14-50 power plugs connected to RVs. Perhaps someone has better, more up to date information.