It's a system designed around a different set of trade-offs. Calling a bug doesn't really make sense. For instance, using full disk encryption means that you lose all your data if you forget your keys. That's not an issue if you use icloud (which presumably has an account recovery process). Based on this, can you say that the "core design principles of full disk encryption are actually bugs"?
It's a bug to the vast majority of people, but that doesn't make it a bug to ultralibertarians.
It's a bug if the goal is actually to have everyone adopt it.