But you're still not going to get appreciably different performance or longevity from a $50 USB-C cable than from a $10 USB-C cable.
And I recognize that it's not exactly the same thing, but as a decent rule of thumb, if the company is willing to actually build the thing in spec, they're probably doing a good enough job that it's going to last a reasonable amount of time, so the spec is still useful for that purpose. To wit: I've never had an in-spec USB-C cable or connector fail.