Didn't they say it already? They basically think that the OpenSSL API is convoluted. That's my understanding of the comment above, at least.
Unnecessarily complicated APIs are a security code smell precisely because they help hide bugs, leaky abstractions, insecure state, and other exploitable issues.
Unnecessarily complicated APIs are a security code smell precisely because they help hide bugs, leaky abstractions, insecure state, and other exploitable issues.