Which is what a "strain relief" is for.

Strain reliefs are used because you have to assume that users will apply strain in every direction imaginable, and some that aren't.

No, that's not the reason. Repeated bending of the weak connection point is the reason, and there's no reinforcement there to protect it.

The class action over the mag-safe connector shows that the strain relief was inadequate.

A class action lawsuit over strain relief shows one thing: that lawyers see Apple as a nice juicy target. Smaller companies have made much worse connectors, but nobody cares, because there is no profit to be had from suing them.