Also not an electrician.

A concern for high current outlets in the US, such as NEMA 14-50, is that they weren't necessarily designed for a large number of plug/unplug cycles. Typically you'd plug your stove in and leave it there for years to decades.

If you use the same 14-50 outlet for car charging, which is not uncommon, the contacts can lose their grip over time. End users may want to take their mobile EVSE with them and incur cycles on the outlet. Properly installed but worn 14-50s have been known to melt or even catch fire under these conditions.

End users should prefer to have their EVSE(s) hardwired or installed with a higher grade outlet like Hubbell or Bryant.

Having charged 2 EVs on wall sockets for years, I've not seen them go over 12 amps, so that checks out.

One of those was a leaf

i'm always surprised how people here downvote correct information. This is 100% correct because heat in electrical wiring is a function of power (current) and time. The vast majority of electrical devices in a typical home use under 80% of their rated power. The few that do use their full power, like a resistive heater, often do not run continuously.

In contrast, it is completely normal to charge an EV at a socket's maximum power for over ten hours straight. This time component is why charging EVs from a regular AC outlet can be a fire risk.

That still didn't explain anything. Surely the car could limit itself to 80% of standard socket rated output for continuous draw, like they do in other countries. Are Norwegian outlets commonly installed so far below spec that that will cause them to catch fire? What was the impetus for this regulation?